Pub Date : 2026-03-15Epub Date: 2026-01-23DOI: 10.1016/j.jmmm.2026.173856
Carlo Appino , Enzo Ferrara , Nicoleta Banu , Clementine Delaunay , Fabien Sixdenier , Charles Joubert , Carlo Ragusa , Song Huang , Luigi Solimene , Olivier de la Barrière , Fausto Fiorillo
A comparison of the magnetic energy loss measurement in non-oriented Fe–Si sheets under alternating and rotational polarization has been accomplished by four European laboratories using different Rotational Single-Sheet Tester (RSST) setups and different sample shapes. The measurements, performed in the frequency and polarization intervals 5 Hz ≤ f ≤ 200 Hz, 1.0 T ≤ Jp ≤ 1.5 T, aimed at providing a benchmark test for these special measurements, looking for a connection between the RSST outcomes and absolute loss values, obtained by a combination of IEC 60404-2 Epstein data and precise local measurements. The laboratory-averaged RSST alternating loss values are found to range in a ±5% interval around the reference values, with the lab-to-lab discrepancies chiefly descending from the heterogeneous variety of the employed magnetic circuits. Numerical analysis highlights the critical role of the effective field and its uniformity across the RSST sensing area. The statistical assessment of the laboratories' best estimates provides the empirical standard deviations s = 4.5% and s = 3.6% for the alternating and rotational loss figures, respectively, thereby showing a significantly reduced dispersion of the results compared with a previous international comparison launched in the ‘90s. It additionally points to the circular geometry for both sample and magnetizer as best suited for the prospective standardization of 2D measurements.
{"title":"Towards absolute measurements of magnetic losses by the rotational single sheet tester (RSST): an interlaboratory comparison","authors":"Carlo Appino , Enzo Ferrara , Nicoleta Banu , Clementine Delaunay , Fabien Sixdenier , Charles Joubert , Carlo Ragusa , Song Huang , Luigi Solimene , Olivier de la Barrière , Fausto Fiorillo","doi":"10.1016/j.jmmm.2026.173856","DOIUrl":"10.1016/j.jmmm.2026.173856","url":null,"abstract":"<div><div>A comparison of the magnetic energy loss measurement in non-oriented Fe–Si sheets under alternating and rotational polarization has been accomplished by four European laboratories using different Rotational Single-Sheet Tester (RSST) setups and different sample shapes. The measurements, performed in the frequency and polarization intervals 5 Hz ≤ <em>f</em> ≤ 200 Hz, 1.0 T ≤ <em>J</em><sub>p</sub> ≤ 1.5 T, aimed at providing a benchmark test for these special measurements, looking for a connection between the RSST outcomes and absolute loss values, obtained by a combination of IEC 60404-2 Epstein data and precise local measurements. The laboratory-averaged RSST alternating loss values are found to range in a ±5% interval around the reference values, with the lab-to-lab discrepancies chiefly descending from the heterogeneous variety of the employed magnetic circuits. Numerical analysis highlights the critical role of the effective field and its uniformity across the RSST sensing area. The statistical assessment of the laboratories' best estimates provides the empirical standard deviations <em>s</em> = 4.5% and <em>s</em> = 3.6% for the alternating and rotational loss figures, respectively, thereby showing a significantly reduced dispersion of the results compared with a previous international comparison launched in the ‘90s. It additionally points to the circular geometry for both sample and magnetizer as best suited for the prospective standardization of 2D measurements.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173856"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-02-06DOI: 10.1016/j.jmmm.2026.173912
H. Fabrelli , C. Macchiutti , J.R. Jesus , D.A. Mayoh , G. Balakrishnan , L. Bufaiçal , E.M. Bittar
The LnBaMnO5 (Ln = rare-earth) manganites have attracted considerable recent interest due to their potential for use as oxygen storage materials and as solid oxide fuel cells. However, there is scarce data on the magnetic properties of some prototypical materials. Here, we report the synthesis of a single-crystalline NdBaMnO compound by the floating-zone method and investigate its structural, electronic, and magnetic properties. The structural data indicate that, at room temperature, the material consists of a mixture of a NdBaMnO5 phase with a layered arrangement of the Nd/Ba ions (space group ) and a NdBaMnO6 phase with a disordered distribution of Nd/Ba (space group ). Measurements of magnetization performed with the magnetic field applied at distinct crystallographic directions reveal a rich magnetic diagram, which is compared with that of similar rare-earth manganites. A peculiar anisotropy is observed between the axis and the plane of the NdBaMnO phase, suggesting a G-type magnetic structure in which the Mn moments are oriented along the planes. The electrical transport data show a pronounced magnetoresistance, which is discussed in terms of the system’s crystal structure and the presence of mixed-valent Mn.
{"title":"The impact of bi-phasic crystal structure on the magnetic and transport properties of single crystalline NdBaMn2O5+δ","authors":"H. Fabrelli , C. Macchiutti , J.R. Jesus , D.A. Mayoh , G. Balakrishnan , L. Bufaiçal , E.M. Bittar","doi":"10.1016/j.jmmm.2026.173912","DOIUrl":"10.1016/j.jmmm.2026.173912","url":null,"abstract":"<div><div>The LnBaMn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<sub>5</sub> (Ln = rare-earth) manganites have attracted considerable recent interest due to their potential for use as oxygen storage materials and as solid oxide fuel cells. However, there is scarce data on the magnetic properties of some prototypical materials. Here, we report the synthesis of a single-crystalline NdBaMn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>5</mn><mo>+</mo><mi>δ</mi></mrow></msub></math></span> compound by the floating-zone method and investigate its structural, electronic, and magnetic properties. The structural data indicate that, at room temperature, the material consists of a mixture of a NdBaMn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<sub>5</sub> phase with a layered arrangement of the Nd/Ba ions (space group <span><math><mrow><mi>P</mi><mn>4</mn><mo>/</mo><mi>n</mi><mi>m</mi><mi>m</mi></mrow></math></span>) and a NdBaMn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<sub>6</sub> phase with a disordered distribution of Nd/Ba (space group <span><math><mrow><mi>I</mi><mi>m</mi><mi>m</mi><mi>a</mi></mrow></math></span>). Measurements of magnetization performed with the magnetic field applied at distinct crystallographic directions reveal a rich magnetic diagram, which is compared with that of similar rare-earth manganites. A peculiar anisotropy is observed between the <span><math><mi>c</mi></math></span> axis and the <span><math><mrow><mi>a</mi><mi>b</mi></mrow></math></span> plane of the NdBaMn<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>5</mn></mrow></msub></math></span> phase, suggesting a G-type magnetic structure in which the Mn moments are oriented along the <span><math><mrow><mi>a</mi><mi>b</mi></mrow></math></span> planes. The electrical transport data show a pronounced magnetoresistance, which is discussed in terms of the system’s crystal structure and the presence of mixed-valent Mn.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173912"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-02-09DOI: 10.1016/j.jmmm.2026.173916
Eduardo Saavedra , Lucy A. Valdez , Pablo Díaz , Noelia Bajales , Juan Escrig
We investigate how the orientation of an external magnetic field influences magnetization reversal and spin textures in FeGe nanocylinders using micromagnetic simulations based on the Landau–Lifshitz–Gilbert equation in MuMax3. FeGe, a prototypical chiral magnet with Dzyaloshinskii–Moriya interaction (DMI), stabilizes nontrivial spin textures such as skyrmions. We analyze nanocylinders of fixed length (50 nm) and diameters of 50–100 nm, subjected to fields applied at angles from 1° to 91° relative to the cylinder axis. Results show a pronounced angular dependence of coercivity and remanence, with sharp drops at diameter-dependent critical angles marking transitions from skyrmion-mediated reversal to trivial helical modes. Topological charge analysis confirms that below the critical angle, slices exhibit values near unity, while above it, the topological character vanishes. For larger diameters (90–100 nm), S-shaped helices linked to remanence minima emerge. These findings highlight angular control as a design parameter in spintronic devices exploiting topological textures.
{"title":"Engineering skyrmion and helical states in FeGe nanocylinders through angular field control","authors":"Eduardo Saavedra , Lucy A. Valdez , Pablo Díaz , Noelia Bajales , Juan Escrig","doi":"10.1016/j.jmmm.2026.173916","DOIUrl":"10.1016/j.jmmm.2026.173916","url":null,"abstract":"<div><div>We investigate how the orientation of an external magnetic field influences magnetization reversal and spin textures in FeGe nanocylinders using micromagnetic simulations based on the Landau–Lifshitz–Gilbert equation in MuMax3. FeGe, a prototypical chiral magnet with Dzyaloshinskii–Moriya interaction (DMI), stabilizes nontrivial spin textures such as skyrmions. We analyze nanocylinders of fixed length (50 nm) and diameters of 50–100 nm, subjected to fields applied at angles from 1° to 91° relative to the cylinder axis. Results show a pronounced angular dependence of coercivity and remanence, with sharp drops at diameter-dependent critical angles marking transitions from skyrmion-mediated reversal to trivial helical modes. Topological charge analysis confirms that below the critical angle, slices exhibit values near unity, while above it, the topological character vanishes. For larger diameters (90–100 nm), S-shaped helices linked to remanence minima emerge. These findings highlight angular control as a design parameter in spintronic devices exploiting topological textures.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173916"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-02-07DOI: 10.1016/j.jmmm.2026.173917
Shichao Zhang , Shuang Pan , Kaixin Zhu , Yuqing Bai , Chengcheng Xu , Xinji Xiang , Jun Liu , Feng Xu , Guizhou Xu
The magnetic chiral soliton lattice (CSL) is a topological spin texture with remarkable stability, arising from the competition between monoaxial Dzyaloshinskii–Moriya (DM) interaction and Heisenberg exchange interaction. In this study, we introduce Fe substitution into the prototypical CSL system Cr1/3NbS2, which effectively reduces its in-plane magnetic anisotropy. Notably, both the chiral helical order and the CSL state persist in the (Cr1-xFex)1/3NbS2 compound at x = 0.13, exhibiting a stripe period of approximately 72 nm at zero magnetic field. Combined with atomistic spin model simulations, we suggest that the enlarged period of magnetic stripes, compared to pristine Cr1/3NbS2, can originate from the DM change or reduced magnetic anisotropy. This work elucidates the important role of magnetic anisotropy in determining the CSL state.
{"title":"Modulation of the magnetic soliton lattice by Fe doping in Cr1/3NbS2","authors":"Shichao Zhang , Shuang Pan , Kaixin Zhu , Yuqing Bai , Chengcheng Xu , Xinji Xiang , Jun Liu , Feng Xu , Guizhou Xu","doi":"10.1016/j.jmmm.2026.173917","DOIUrl":"10.1016/j.jmmm.2026.173917","url":null,"abstract":"<div><div>The magnetic chiral soliton lattice (CSL) is a topological spin texture with remarkable stability, arising from the competition between monoaxial Dzyaloshinskii–Moriya (DM) interaction and Heisenberg exchange interaction. In this study, we introduce Fe substitution into the prototypical CSL system Cr<sub>1/3</sub>NbS<sub>2</sub>, which effectively reduces its in-plane magnetic anisotropy. Notably, both the chiral helical order and the CSL state persist in the (Cr<sub>1-x</sub>Fe<sub>x</sub>)<sub>1/3</sub>NbS<sub>2</sub> compound at <em>x</em> = 0.13, exhibiting a stripe period of approximately 72 nm at zero magnetic field. Combined with atomistic spin model simulations, we suggest that the enlarged period of magnetic stripes, compared to pristine Cr<sub>1/3</sub>NbS<sub>2</sub>, can originate from the DM change or reduced magnetic anisotropy. This work elucidates the important role of magnetic anisotropy in determining the CSL state.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173917"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-02-07DOI: 10.1016/j.jmmm.2026.173908
Gaoshang Gong , Xiaoying Chen , Yanxin Gao , Mengmeng Lun , Maocai Wei , Yongqiang Wang , Yuling Su
The double perovskite Dy2CoMnO6 polycrystalline was synthesized successfully. Its structure, magnetization and dielectric properties were studied. Refinement of the XRD diffraction data reveals a monoclinic structure for Dy2CoMnO6 compound. Unlike multiferroic Lu2CoMnO6, no spontaneous ferroelectric polarization is detected in Dy2CoMnO6. This difference can be attributed to that the different ionic radii of rare earth affect the sign and strength of the super-exchange interaction of Co2+-O-Mn4+. It causes the Dy2CoMnO6 to have a ferromagnetic ground state. Therefore, the spatial inversion symmetry in Dy2CoMnO6 can't be broken and spontaneous ferroelectricity is absent. But the Dy2CoMnO6 still present obvious magnetodielectric coupling. By investing the magnetic field dependent dielectric permittivity and dielectric loss, we demonstrate that the intrinsic coupling effect such as the reorientation of Co2+-Mn4+ dipole and the magnetostriction play the dominant role at low temperature. At high temperature the magnetoelectric coupling of Dy2CoMnO6 mainly comes from the magnetoresistance and Maxwell-Wagner effect.
{"title":"Ferromagnetic ordering and magnetodielectric coupling in paraelectric Dy2CoMnO6 perovskite","authors":"Gaoshang Gong , Xiaoying Chen , Yanxin Gao , Mengmeng Lun , Maocai Wei , Yongqiang Wang , Yuling Su","doi":"10.1016/j.jmmm.2026.173908","DOIUrl":"10.1016/j.jmmm.2026.173908","url":null,"abstract":"<div><div>The double perovskite Dy<sub>2</sub>CoMnO<sub>6</sub> polycrystalline was synthesized successfully. Its structure, magnetization and dielectric properties were studied. Refinement of the XRD diffraction data reveals a monoclinic structure for Dy<sub>2</sub>CoMnO<sub>6</sub> compound. Unlike multiferroic Lu<sub>2</sub>CoMnO<sub>6</sub>, no spontaneous ferroelectric polarization is detected in Dy<sub>2</sub>CoMnO<sub>6</sub>. This difference can be attributed to that the different ionic radii of rare earth affect the sign and strength of the super-exchange interaction of Co<sup>2+</sup>-O-Mn<sup>4+</sup>. It causes the Dy<sub>2</sub>CoMnO<sub>6</sub> to have a ferromagnetic ground state. Therefore, the spatial inversion symmetry in Dy<sub>2</sub>CoMnO<sub>6</sub> can't be broken and spontaneous ferroelectricity is absent<sub>.</sub> But the Dy<sub>2</sub>CoMnO<sub>6</sub> still present obvious magnetodielectric coupling. By investing the magnetic field dependent dielectric permittivity and dielectric loss, we demonstrate that the intrinsic coupling effect such as the reorientation of Co<sup>2+</sup>-Mn<sup>4+</sup> dipole and the magnetostriction play the dominant role at low temperature. At high temperature the magnetoelectric coupling of Dy<sub>2</sub>CoMnO<sub>6</sub> mainly comes from the magnetoresistance and Maxwell-Wagner effect.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173908"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-01-31DOI: 10.1016/j.jmmm.2026.173899
Arun Kumar S M , M Manjunatha , G Srinivasa Reddy , S Anandh Jesuraj , Basavaraj Angadi , David Laroze , Thipperudrappa J
We report the structural, magnetic, and colossal magnetoresistance (CMR) properties of Sr2+ − doped lanthanum manganites La1-xSrxMnO3 (x = 0.3, 0.4, 0.5) (LSMO) synthesized via the gel combustion method. X – ray diffraction (XRD) confirmed the formation of a single – phase rhombohedral perovskite structure (space group R3̅c), with refined lattice parameters showing a systematic decrease in the c-axis and crystallite sizes increasing from 20.85 to 23.02 nm as Sr2+ content increased. Fourier-transform infrared (FTIR) spectra exhibited Mn – O bending (∼ 500 cm−1) and stretching (∼ 640 cm−1) modes, with peak shifts and intensity changes confirming lattice strain and successful Sr2+ substitution. Raman spectroscopy revealed eight phonon modes (199–727 cm−1), including A1g and Eg symmetries, indicating local lattice distortions and Jahn – Teller effects due to Sr2+ doping. Magnetic properties were studied using vibrating sample magnetometry (VSM) and ferromagnetic resonance (FMR). VSM results showed decreasing saturation magnetization (MS) (57.10–34.69 emu/g) and increasing coercivity with Sr2+ doping, attributed to reduced double exchange interactions and increased Mn4+ content. FMR analysis showed enhanced g-factors (>2.00), with low – temperature data (77 K) indicating increased ferromagnetic ordering and static Jahn – Teller distortion. X – ray photoelectron spectroscopy (XPS) and 55Mn internal field nuclear magnetic resonance (IFNMR) were employed to analyze oxidation states and local magnetic environments, quantifying Mn3+/Mn4+ ratios and their role in magnetic behavior. CMR properties measured at 77 K revealed significant magnetoresistance, affirming the potential of these materials for applications in magnetic sensing, data storage, and spintronic devices.
{"title":"Correlated structural, magnetic and colossal magnetoresistance properties of La1-xSrxMnO3: Insights from XPS and 55Mn IFNMR","authors":"Arun Kumar S M , M Manjunatha , G Srinivasa Reddy , S Anandh Jesuraj , Basavaraj Angadi , David Laroze , Thipperudrappa J","doi":"10.1016/j.jmmm.2026.173899","DOIUrl":"10.1016/j.jmmm.2026.173899","url":null,"abstract":"<div><div>We report the structural, magnetic, and colossal magnetoresistance (CMR) properties of Sr<sup>2+</sup> − doped lanthanum manganites La<sub>1-<em>x</em></sub>Sr<sub><em>x</em></sub>MnO<sub>3</sub> (<em>x</em> = 0.3, 0.4, 0.5) (LSMO) synthesized via the gel combustion method. X – ray diffraction (XRD) confirmed the formation of a single – phase rhombohedral perovskite structure (space group <em>R</em>3̅<em>c</em>), with refined lattice parameters showing a systematic decrease in the <em>c</em>-axis and crystallite sizes increasing from 20.85 to 23.02 nm as Sr<sup>2+</sup> content increased. Fourier-transform infrared (FTIR) spectra exhibited Mn – O bending (∼ 500 cm<sup>−1</sup>) and stretching (∼ 640 cm<sup>−1</sup>) modes, with peak shifts and intensity changes confirming lattice strain and successful Sr<sup>2+</sup> substitution. Raman spectroscopy revealed eight phonon modes (199–727 cm<sup>−1</sup>), including A<sub>1g</sub> and E<sub>g</sub> symmetries, indicating local lattice distortions and Jahn – Teller effects due to Sr<sup>2+</sup> doping. Magnetic properties were studied using vibrating sample magnetometry (VSM) and ferromagnetic resonance (FMR). VSM results showed decreasing saturation magnetization (<em>M</em><sub><em>S</em></sub>) (57.10–34.69 emu/g) and increasing coercivity with Sr<sup>2+</sup> doping, attributed to reduced double exchange interactions and increased Mn<sup>4+</sup> content. FMR analysis showed enhanced <em>g</em>-factors (>2.00), with low – temperature data (77 K) indicating increased ferromagnetic ordering and static Jahn – Teller distortion. X – ray photoelectron spectroscopy (XPS) and <sup>55</sup>Mn internal field nuclear magnetic resonance (IFNMR) were employed to analyze oxidation states and local magnetic environments, quantifying Mn<sup>3+</sup>/Mn<sup>4+</sup> ratios and their role in magnetic behavior. CMR properties measured at 77 K revealed significant magnetoresistance, affirming the potential of these materials for applications in magnetic sensing, data storage, and spintronic devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173899"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-02-04DOI: 10.1016/j.jmmm.2026.173903
M. Marchwiany , A. Majhofer , J. Szczytko , A. Twardowski
We investigate magnetic properties of a three-dimensional (3D) system of identical, spherical, single-domain, ferromagnetic nanoparticles with cubic magnetocrystalline anisotropy. Particles are immobilised in a nonmagnetic medium. Using the Monte Carlo techniques we simulate zero field cooled (ZFC) and field cooled (FC) experiments and calculate hysteresis curves for systems with different inter-particle distances. We compare results obtained when particles occupy sites of a simple cubic lattice with their anisotropy axes oriented randomly (Case A) and when particles are distributed randomly in space but with exactly parallel anisotropy axes of all nanoparticles (Case B). Values of the physical parameters used in our simulations correspond to the particles built of fcc-Co.
{"title":"Magnetic properties of a three-dimensional system of ordered nanoparticles with cubic anisotropy: A Monte Carlo study","authors":"M. Marchwiany , A. Majhofer , J. Szczytko , A. Twardowski","doi":"10.1016/j.jmmm.2026.173903","DOIUrl":"10.1016/j.jmmm.2026.173903","url":null,"abstract":"<div><div>We investigate magnetic properties of a three-dimensional (3D) system of identical, spherical, single-domain, ferromagnetic nanoparticles with cubic magnetocrystalline anisotropy. Particles are immobilised in a nonmagnetic medium. Using the Monte Carlo techniques we simulate zero field cooled (ZFC) and field cooled (FC) experiments and calculate hysteresis curves for systems with different inter-particle distances. We compare results obtained when particles occupy sites of a simple cubic lattice with their anisotropy axes oriented randomly (Case A) and when particles are distributed randomly in space but with exactly parallel anisotropy axes of all nanoparticles (Case B). Values of the physical parameters used in our simulations correspond to the particles built of fcc-Co.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173903"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-02-09DOI: 10.1016/j.jmmm.2026.173918
Pham Thi Thanh , Nguyen Mau Lam , Nguyen Huy Ngoc , Kieu Xuan Hau , Nguyen Hai Yen , Do Khanh Tung , Huu T. Do , Jung-Goo Lee , Nguyen Huy Dan
Binary manganese-bismuthide-based (MnBi) alloys emerge as an exceptional archetype for a promising transition-metal-bearing hard magnet, but the high-quality alloying formation of the ferromagnetic phases is predominantly hindered by the peritectic reaction of transition metal Mn and semimetal Bi during the solidification procedure, as well as usually containing non-magnetic impurities. To alleviate these issues, we employed the well-established bottom-up procedure, including rapid melt-spinning, followed by a thermal crystalline-growth-assisted annealing process, to fabricate high-performance stoichiometric Mn54Bi46 alloying ribbon and its Sb-doped samples. Substituting a small amount (up to 4 at. %) of isovalent configuration (sp) Sb for Bi in the samples pronounces the particle-size reduction, resulting in a typically positive effect of coercivity force in phase formation as well as fractional enhancement of the ferromagnetic MnBi phases. In particular, the underlying permanent magnetic features, such as coercivity () and saturation magnetization (), reach corresponding values of 14 kOe with 20 emu/g and 10.5 kOe with 52.5 emu/g, with a typical = 3.9 MGOe for 2 at. % Sb-doping concentration before and after the annealing conditions of 200 °C for 2 h. While magnetocrystalline anisotropy is a missing piece in previous studies of Sb-doped MnBi materials, by applying the law of approach to saturation magnetization to high-field magnetic data, we obtain = 0.92–1.1 MJ/m for the 0–3 at. % Sb-doping annealed samples, which overlap with the known value of pristine MnBi alloys.
{"title":"Alleviating the peritectic phase formation of Mn–Bi hard magnets: Effect of isovalent Sb-doping and prospective short-time thermal-assisted annealing","authors":"Pham Thi Thanh , Nguyen Mau Lam , Nguyen Huy Ngoc , Kieu Xuan Hau , Nguyen Hai Yen , Do Khanh Tung , Huu T. Do , Jung-Goo Lee , Nguyen Huy Dan","doi":"10.1016/j.jmmm.2026.173918","DOIUrl":"10.1016/j.jmmm.2026.173918","url":null,"abstract":"<div><div>Binary manganese-bismuthide-based (MnBi) alloys emerge as an exceptional archetype for a promising transition-metal-bearing hard magnet, but the high-quality alloying formation of the ferromagnetic phases is predominantly hindered by the peritectic reaction of transition metal Mn and semimetal Bi during the solidification procedure, as well as usually containing non-magnetic impurities. To alleviate these issues, we employed the well-established bottom-up procedure, including rapid melt-spinning, followed by a thermal crystalline-growth-assisted annealing process, to fabricate high-performance stoichiometric Mn<sub>54</sub>Bi<sub>46</sub> alloying ribbon and its Sb-doped samples. Substituting a small amount (up to 4 at. %) of isovalent configuration (s<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>p<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>) Sb for Bi in the samples pronounces the particle-size reduction, resulting in a typically positive effect of coercivity force in phase formation as well as fractional enhancement of the ferromagnetic MnBi phases. In particular, the underlying permanent magnetic features, such as coercivity (<span><math><msub><mrow><mi>H</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) and saturation magnetization (<span><math><msub><mrow><mi>M</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span>), reach corresponding values of 14 kOe with 20 emu/g and 10.5 kOe with 52.5 emu/g, with a typical <span><math><msub><mrow><mrow><mo>(</mo><mi>B</mi><mi>H</mi><mo>)</mo></mrow></mrow><mrow><mtext>max</mtext></mrow></msub></math></span> = 3.9 MGOe for 2 at. % Sb-doping concentration before and after the annealing conditions of 200 °C for 2 h. While magnetocrystalline anisotropy <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span> is a missing piece in previous studies of Sb-doped MnBi materials, by applying the law of approach to saturation magnetization to high-field magnetic data, we obtain <span><math><msub><mrow><mi>K</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span> = 0.92–1.1 MJ/m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span> for the 0–3 at. % Sb-doping annealed samples, which overlap with the known value of pristine MnBi alloys.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173918"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-02-07DOI: 10.1016/j.jmmm.2026.173877
Xinhui Ma, Guanqi Ye, Fusheng Ma
With the development of quantum information technologies, the nonlinear effects of coupled magnon-photon systems have drawn great attention. In this work, we design and fabricate an R-shaped planar microresonator (PMR) with high quality factor and high microwave conversion efficiency. The strong coupling between microwave photons in PMR and magnons in YIG is achieved under different configurations of bias magnetic field. Interestingly, under out-of-plane bias field and high microwave power, the spectrum displays two characteristics: the blue shift of magnon mode and the comb-like feature. The blue shift of magnon mode originates from the intrinsic magnon nonlinearity, and the comb-like spectrum originates from the hybridization of magnon mode with microwave photon mode and phonon modes. Our findings indicate the potential of PMR for exploring nonlinear cavity magnonics and on-chip integrated quantum information technologies.
{"title":"Planar microresonator-assisted nonlinear magnetization dynamics based on strong magnon-photon coupling","authors":"Xinhui Ma, Guanqi Ye, Fusheng Ma","doi":"10.1016/j.jmmm.2026.173877","DOIUrl":"10.1016/j.jmmm.2026.173877","url":null,"abstract":"<div><div>With the development of quantum information technologies, the nonlinear effects of coupled magnon-photon systems have drawn great attention. In this work, we design and fabricate an R-shaped planar microresonator (PMR) with high quality factor and high microwave conversion efficiency. The strong coupling between microwave photons in PMR and magnons in YIG is achieved under different configurations of bias magnetic field. Interestingly, under out-of-plane bias field and high microwave power, the spectrum displays two characteristics: the blue shift of magnon mode and the comb-like feature. The blue shift of magnon mode originates from the intrinsic magnon nonlinearity, and the comb-like spectrum originates from the hybridization of magnon mode with microwave photon mode and phonon modes. Our findings indicate the potential of PMR for exploring nonlinear cavity magnonics and on-chip integrated quantum information technologies.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173877"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-15Epub Date: 2026-01-22DOI: 10.1016/j.jmmm.2026.173830
J.C. Rodriguez E. , L. Avilés-Félix , M.H. Aguirre , L.M. Rodríguez , D. Salomoni , S. Auffret , R.C. Sousa , I.L. Prejbeanu , A.E. Bruchhausen , E. De Biasi , J. Curiale
Rare earth/transition metal (RE/TM) multilayers with perpendicular magnetic anisotropy are key ingredients for the development of spintronic applications. Their compensation temperature depends on the ratio of the thicknesses of rare earth and transition metal, allowing their magnetic properties to be tuned with temperature while maintaining their anisotropy even in nanometer-scale devices. In this work, we performed a thorough structural characterization and systematically investigate the magnetic properties of a whole family of ferrimagnetic [Tb/Co] multilayers varying the Tb thickness in the range of 0.4nm - 1.25nm. A linear dependence of the compensation temperature on the Tb layer thickness was observed. Moreover, a uniaxial anisotropy constant of , which is close to the values reported by other authors, was estimated. Additionally, we proposed a model to gain a better understanding of the angular dependence of the magnetization loops and the linear dependence of the compensation temperature. We present strong evidence demonstrating that the perpendicular anisotropy must be tilted away from the perpendicular axis in order to explain the observed features, particularly the hysteresis in the in-plane loops. Our work advances the understanding of DC magnetic properties in thin RE/TM ferrimagnetic films, which has the potential to impact different fields where these materials are involved.
{"title":"Perpendicularly magnetized Tb/Co multilayers featuring tilted uniaxial anisotropy: Experiments and modeling","authors":"J.C. Rodriguez E. , L. Avilés-Félix , M.H. Aguirre , L.M. Rodríguez , D. Salomoni , S. Auffret , R.C. Sousa , I.L. Prejbeanu , A.E. Bruchhausen , E. De Biasi , J. Curiale","doi":"10.1016/j.jmmm.2026.173830","DOIUrl":"10.1016/j.jmmm.2026.173830","url":null,"abstract":"<div><div>Rare earth/transition metal (RE/TM) multilayers with perpendicular magnetic anisotropy are key ingredients for the development of spintronic applications. Their compensation temperature depends on the ratio of the thicknesses of rare earth and transition metal, allowing their magnetic properties to be tuned with temperature while maintaining their anisotropy even in nanometer-scale devices. In this work, we performed a thorough structural characterization and systematically investigate the magnetic properties of a whole family of ferrimagnetic [Tb/Co]<span><math><msub><mrow></mrow><mrow><mo>×</mo><mn>5</mn></mrow></msub></math></span> multilayers varying the Tb thickness in the range of 0.4nm - 1.25nm. A linear dependence of the compensation temperature on the Tb layer thickness was observed. Moreover, a uniaxial anisotropy constant of <span><math><mrow><mrow><mo>(</mo><mn>330</mn><mo>±</mo><mn>30</mn><mo>)</mo></mrow><mspace></mspace><mstyle><mstyle><mi>k</mi><mi>J</mi></mstyle></mstyle><mo>/</mo><msup><mrow><mstyle><mstyle><mi>m</mi></mstyle></mstyle></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span>, which is close to the values reported by other authors, was estimated. Additionally, we proposed a model to gain a better understanding of the angular dependence of the magnetization loops and the linear dependence of the compensation temperature. We present strong evidence demonstrating that the perpendicular anisotropy must be tilted away from the perpendicular axis in order to explain the observed features, particularly the hysteresis in the in-plane loops. Our work advances the understanding of DC magnetic properties in thin RE/TM ferrimagnetic films, which has the potential to impact different fields where these materials are involved.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"642 ","pages":"Article 173830"},"PeriodicalIF":3.0,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146057463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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