Pub Date : 2026-03-01Epub Date: 2026-01-17DOI: 10.1016/j.jmmm.2026.173859
Alberto Ghirri , Mattia Cavani , Claudio Bonizzoni , Marco Affronte
In cavity magnonics, magnon–photon hybridization has been widely investigated for both fundamental studies and applications. Planar superconducting resonators operating at microwave frequencies have demonstrated the possibility to achieve high couplings with magnons by exploiting the confinement of the microwave field in a reduced volume. Here we report a study of the coupling of high- YBCO superconducting waveguides with 104-nm-thick YIG magnetic films. We study the evolution of mode frequencies as a function of temperature and extract the coupling strength of hybrid magnon–photon modes. We show that the experimental results can be reproduced using a simple model in which the temperature dependence of the penetration depth accounts for the evolution of the polaritonic spectrum.
{"title":"Coherent coupling between YBCO superconducting resonators and sub-micrometer-thick YIG films","authors":"Alberto Ghirri , Mattia Cavani , Claudio Bonizzoni , Marco Affronte","doi":"10.1016/j.jmmm.2026.173859","DOIUrl":"10.1016/j.jmmm.2026.173859","url":null,"abstract":"<div><div>In cavity magnonics, magnon–photon hybridization has been widely investigated for both fundamental studies and applications. Planar superconducting resonators operating at microwave frequencies have demonstrated the possibility to achieve high couplings with magnons by exploiting the confinement of the microwave field in a reduced volume. Here we report a study of the coupling of high-<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> YBCO superconducting waveguides with 104-nm-thick YIG magnetic films. We study the evolution of mode frequencies as a function of temperature and extract the coupling strength of hybrid magnon–photon modes. We show that the experimental results can be reproduced using a simple model in which the temperature dependence of the penetration depth accounts for the evolution of the polaritonic spectrum.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173859"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035308","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}
Permanent magnets are essential components of many modern devices, and their economic demand is constantly growing. Magnets based on rare-earth elements exhibit the best properties. However, their production is associated with high costs and environmental risks. Therefore, alternative magnetic materials are of interest. The ferromagnetic τ-phase in the MnAl system is the most promising candidate among Mn-based ferromagnetic compounds for filling the gap between hard ferrites and rare-earth element-based magnets, both in terms of magnetic properties and cost. Numerous studies have been devoted to their investigation, but economically viable production of Mn-Al-based magnets has not yet been realized. Therefore, new approaches to processing τ-MnAl alloys that can achieve properties close to the theoretical level are required. This review analyzes the most relevant research on τ-MnAl alloys. The main patterns of formation and decomposition of the ferromagnetic τ-phase, as well as its magnetic structure and theoretical level of magnetic properties are described. The main defects of the τ-phase crystal structure and their influence on magnetic properties are considered. Information on the studied alloying systems of MnAl ferromagnetic alloys is provided. Possible methods for obtaining and processing the ferromagnetic MnAl alloys are reviewed, including rapid quenching, powder milling and compaction methods, as well as hot and cold deformation. Promising research directions are suggested based on the analysis performed.
{"title":"Ferromagnetic τ-phase of MnAl system: properties, microstructure and processing methods. A review","authors":"A.S. Fortuna, N.M. Vazhinskii, K.S. Nechaev, M.V. Gorshenkov","doi":"10.1016/j.jmmm.2026.173855","DOIUrl":"10.1016/j.jmmm.2026.173855","url":null,"abstract":"<div><div>Permanent magnets are essential components of many modern devices, and their economic demand is constantly growing. Magnets based on rare-earth elements exhibit the best properties. However, their production is associated with high costs and environmental risks. Therefore, alternative magnetic materials are of interest. The ferromagnetic τ-phase in the Mn<img>Al system is the most promising candidate among Mn-based ferromagnetic compounds for filling the gap between hard ferrites and rare-earth element-based magnets, both in terms of magnetic properties and cost. Numerous studies have been devoted to their investigation, but economically viable production of Mn-Al-based magnets has not yet been realized. Therefore, new approaches to processing τ-MnAl alloys that can achieve properties close to the theoretical level are required. This review analyzes the most relevant research on τ-MnAl alloys. The main patterns of formation and decomposition of the ferromagnetic τ-phase, as well as its magnetic structure and theoretical level of magnetic properties are described. The main defects of the τ-phase crystal structure and their influence on magnetic properties are considered. Information on the studied alloying systems of Mn<img>Al ferromagnetic alloys is provided. Possible methods for obtaining and processing the ferromagnetic Mn<img>Al alloys are reviewed, including rapid quenching, powder milling and compaction methods, as well as hot and cold deformation. Promising research directions are suggested based on the analysis performed.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173855"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035305","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 : 2026-03-01Epub Date: 2026-01-07DOI: 10.1016/j.jmmm.2026.173818
Tan Hu, Yujie Yang, Zhihao Geng, Shaofan Ge, Hongyu Ding
To enhance the magnetic properties of ferrites, Ni0.50Zn0.4+xMg0.10Fe1.96-2xTixO4 (x = 0, 0.06, 0.12, 0.18) ferrite samples were prepared using the solid-phase sintering method. X-ray diffraction (XRD) results confirmed that all samples possessed a single spinel phase. Magnetization (M-H) curves indicated that the NiZnMgTi ferrites exhibited low remanent magnetization (Mr) and coercivity (Hc), demonstrating their typical soft magnetic characteristics. The sample with x = 0.06 exhibited superior magnetic properties. Compared to the undoped sample (x = 0), its real part permeability (μ’) showed significant enhancement. At 1000 kHz, the μ’ value for x = 0 was 137.5, while for x = 0.06, it reached 176.9. Furthermore, the core loss (Pcv) at 1000 kHz for the x = 0.06 composition was 668.1 mW/cm3, representing an approximately 20% reduction compared to the 838.6 mW/cm3 loss of the undoped sample (x = 0). These findings suggest that the substitution of Zn2+ and Ti4+ ions for a small portion of the Fe ions is beneficial for improving the permeability and reducing the power loss in NiZnMgTi ferrites, providing a valuable reference for optimizing ferrite magnetic properties.
{"title":"Effect of Ti4+ and Zn2+ ion contents on the magnetic properties of NiZnMgTi ferrite","authors":"Tan Hu, Yujie Yang, Zhihao Geng, Shaofan Ge, Hongyu Ding","doi":"10.1016/j.jmmm.2026.173818","DOIUrl":"10.1016/j.jmmm.2026.173818","url":null,"abstract":"<div><div>To enhance the magnetic properties of ferrites, Ni<sub>0.50</sub>Zn<sub>0.4+x</sub>Mg<sub>0.10</sub>Fe<sub>1.96-2x</sub>Ti<sub>x</sub>O<sub>4</sub> (x = 0, 0.06, 0.12, 0.18) ferrite samples were prepared using the solid-phase sintering method. X-ray diffraction (XRD) results confirmed that all samples possessed a single spinel phase. Magnetization (<em>M</em>-<em>H</em>) curves indicated that the NiZnMgTi ferrites exhibited low remanent magnetization (<em>M</em><sub>r</sub>) and coercivity (<em>H</em><sub>c</sub>), demonstrating their typical soft magnetic characteristics. The sample with x = 0.06 exhibited superior magnetic properties. Compared to the undoped sample (x = 0), its real part permeability (<em>μ’</em>) showed significant enhancement. At 1000 kHz, the <em>μ’</em> value for x = 0 was 137.5, while for x = 0.06, it reached 176.9. Furthermore, the core loss (<em>P</em><sub>cv</sub>) at 1000 kHz for the x = 0.06 composition was 668.1 mW/cm<sup>3</sup>, representing an approximately 20% reduction compared to the 838.6 mW/cm<sup>3</sup> loss of the undoped sample (x = 0). These findings suggest that the substitution of Zn<sup>2+</sup> and Ti<sup>4+</sup> ions for a small portion of the Fe ions is beneficial for improving the permeability and reducing the power loss in NiZnMgTi ferrites, providing a valuable reference for optimizing ferrite magnetic properties.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173818"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941221","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 : 2026-03-01Epub Date: 2026-01-09DOI: 10.1016/j.jmmm.2026.173829
Zihao Ma , Renjie Chen , Xu Tang , Wenzong Yin , Ge Dai , Yeyuan Du , Jinyun Ju , Aru Yan
SmFe12-based compounds with the ThMn12-type structure are considered promising candidates for next-generation permanent magnets due to their low rare-earth content and high intrinsic magnetic properties. However, their practical applications are hindered by the metastable nature of the SmFe12 phase, particularly its poor phase stability, which significantly limits the development of macroscopic magnetic performance, especially coercivity. In this study, by incorporating Gd as a substituent for Sm and precisely controlling the cooling rate during melt spinning along with subsequent annealing, we achieved a high coercivity of 5.1 kOe and a remanence of 8.04 kGs in Sm1-xGdₓ(Fe0.8Co0.2)11Ti melt-spun ribbons. The favorable magnetic properties are attributed to the stabilization of the SmFe12 main phase, the formation of a paramagnetic (Fe, Co)2Ti phase, and the magnetic isolation effect of the Sm-rich grain boundary phase. These findings provide important insights for further optimizing the performance of SmFe12-based permanent magnets through microstructural regulation.
{"title":"Effects of Gd doping on phase composition and magnetic properties of Sm1-xGdx(Fe0.8Co0.2)11Ti melt-spun ribbons","authors":"Zihao Ma , Renjie Chen , Xu Tang , Wenzong Yin , Ge Dai , Yeyuan Du , Jinyun Ju , Aru Yan","doi":"10.1016/j.jmmm.2026.173829","DOIUrl":"10.1016/j.jmmm.2026.173829","url":null,"abstract":"<div><div>SmFe<sub>12</sub>-based compounds with the ThMn<sub>12</sub>-type structure are considered promising candidates for next-generation permanent magnets due to their low rare-earth content and high intrinsic magnetic properties. However, their practical applications are hindered by the metastable nature of the SmFe<sub>12</sub> phase, particularly its poor phase stability, which significantly limits the development of macroscopic magnetic performance, especially coercivity. In this study, by incorporating Gd as a substituent for Sm and precisely controlling the cooling rate during melt spinning along with subsequent annealing, we achieved a high coercivity of 5.1 kOe and a remanence of 8.04 kGs in Sm<sub>1-x</sub>Gdₓ(Fe<sub>0.8</sub>Co<sub>0.2</sub>)<sub>11</sub>Ti melt-spun ribbons. The favorable magnetic properties are attributed to the stabilization of the SmFe<sub>12</sub> main phase, the formation of a paramagnetic (Fe, Co)<sub>2</sub>Ti phase, and the magnetic isolation effect of the Sm-rich grain boundary phase. These findings provide important insights for further optimizing the performance of SmFe<sub>12</sub>-based permanent magnets through microstructural regulation.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173829"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975215","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 : 2026-03-01Epub Date: 2026-01-24DOI: 10.1016/j.jmmm.2026.173872
Jiaxing You , Jiajie Li , Chen Jiang , Yue Huang , Zhixi Deng , Munan Yang , Shuwei Zhong , Xiaoqiang Yu , Sajjad Ur Rehman
SmFe12-based permanent magnets are regarded as potential next-generation of rare earth (RE) permanent materials due to the excellent intrinsic magnetic properties and reduced RE usage. Nevertheless, as a metastable phase, ThMn12-type SmFe phase tends to decompose into other ferromagnetic phases such as α-Fe phase at high temperature, making it challenging to form this phase exclusively in ribbons or bulks. In this study, Sm(Fe0.8Co0.2)11-xTiGax alloy ribbons with nanostructure were prepared by melt-spinning followed by heat treatment. The effects of Ga substitution on the phase composition, microstructure and magnetic properties of the ribbons are studied in detail. The results reveal that the introduction of Ga refines the grains of the 1:12 main phase during the heat treatment process, achieving a coercivity (Hc) of 5.21 kOe and a maximum magnetic energy product ((BH)max) of 8.47 MGOe. The grain refinement leads to the enhancement of the domain wall pinning effect and the uniformly distributed TiFe2 phase as a non-ferromagnetic phase between the main phase grains serves as pinning sites. This interplay is the primary reason for the coercivity enhancement of the ribbons. This work provides a viable strategy to construct the effective non-ferromagnetic intergranular phases in SmFe12-based alloys, aiming to achieve outstanding comprehensive magnetic properties.
{"title":"Magnetic properties and microstructural optimization of Ga modified Sm(Fe,Co,Ti)12 alloy ribbons","authors":"Jiaxing You , Jiajie Li , Chen Jiang , Yue Huang , Zhixi Deng , Munan Yang , Shuwei Zhong , Xiaoqiang Yu , Sajjad Ur Rehman","doi":"10.1016/j.jmmm.2026.173872","DOIUrl":"10.1016/j.jmmm.2026.173872","url":null,"abstract":"<div><div>SmFe<sub>12</sub>-based permanent magnets are regarded as potential next-generation of rare earth (RE) permanent materials due to the excellent intrinsic magnetic properties and reduced RE usage. Nevertheless, as a metastable phase, ThMn<sub>12</sub>-type SmFe phase tends to decompose into other ferromagnetic phases such as α-Fe phase at high temperature, making it challenging to form this phase exclusively in ribbons or bulks. In this study, Sm(Fe<sub>0.8</sub>Co<sub>0.2</sub>)<sub>11-x</sub>TiGa<sub>x</sub> alloy ribbons with nanostructure were prepared by melt-spinning followed by heat treatment. The effects of Ga substitution on the phase composition, microstructure and magnetic properties of the ribbons are studied in detail. The results reveal that the introduction of Ga refines the grains of the 1:12 main phase during the heat treatment process, achieving a coercivity (<em>H</em><sub>c</sub>) of 5.21 kOe and a maximum magnetic energy product ((<em>BH</em>)<sub>max</sub>) of 8.47 MGOe. The grain refinement leads to the enhancement of the domain wall pinning effect and the uniformly distributed TiFe<sub>2</sub> phase as a non-ferromagnetic phase between the main phase grains serves as pinning sites. This interplay is the primary reason for the coercivity enhancement of the ribbons. This work provides a viable strategy to construct the effective non-ferromagnetic intergranular phases in SmFe<sub>12</sub>-based alloys, aiming to achieve outstanding comprehensive magnetic properties.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173872"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146073679","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 : 2026-03-01Epub Date: 2026-01-16DOI: 10.1016/j.jmmm.2026.173846
H.H. Medina Chanduví , A.M. Mudarra Navarro , G. Távara Aponte , R.E. Zavala Sánchez , J.A. Roldán-López , K. Ferradas , L.A. Errico
We present a Density Functional Theory (DFT) based ab initio study of the structural, electronic, magnetic, and hyperfine properties of the semiconducting spinel-ferrite MgFe₂O₄. Calculations were performed using the all-electron Full-Potential Linearized Augmented Plane Wave (FP-LAPW) and the pseudopotential and plane-wave (PW-PP) methods in the frameworks of the Generalized Gradient Approximation (GGA) and GGA + U. To determine the lowest-energy structural and magnetic configuration of MgFe2O4, we examined various spin arrangements and cation distributions of Mg and Fe in the spinel lattice. Our results indicate that MgFe₂O₄ adopts an inverted antiferromagnetic structure. We also show that the energy necessary to reduce the inversion degree from 1 to 0.875 is smaller than those provided by the thermal treatments usually applied for the growth of the samples, showing that the formation of metastable phases with inversion degrees smaller than 1 is plausible, in agreement with the experimental results. Hyperfine interactions properties at Fe sites were obtained and compared to Mössbauer spectroscopy measurements at 4 K and 300 K, enabling a detailed characterization of the local Fe environments and gives support to our structural and magnetic model for MgFe2O4. Based on the results obtained for the bulk calculations, different (001) MgFe2O4 surface terminations were examined and we found that, after a strong surface reconstruction, the most stable termination is the one that exposes Mg, Fe, and O atoms. We show that the surface inversion degree predicted by DFT is lower than the bulk value, a result that is consistent with experimental results obtained in nanoparticles and that cationic inversion in the superficial layers plays a crucial role in the magnetic response of MgFe2O4 nanoparticles and thin films.
{"title":"DFT insight into the structural and magnetic properties of MgFe₂O₄ ferrite: Bulk and surface","authors":"H.H. Medina Chanduví , A.M. Mudarra Navarro , G. Távara Aponte , R.E. Zavala Sánchez , J.A. Roldán-López , K. Ferradas , L.A. Errico","doi":"10.1016/j.jmmm.2026.173846","DOIUrl":"10.1016/j.jmmm.2026.173846","url":null,"abstract":"<div><div>We present a Density Functional Theory (DFT) based ab initio study of the structural, electronic, magnetic, and hyperfine properties of the semiconducting spinel-ferrite MgFe₂O₄. Calculations were performed using the all-electron Full-Potential Linearized Augmented Plane Wave (FP-LAPW) and the pseudopotential and plane-wave (PW-PP) methods in the frameworks of the Generalized Gradient Approximation (GGA) and GGA + <em>U</em>. To determine the lowest-energy structural and magnetic configuration of MgFe<sub>2</sub>O<sub>4</sub>, we examined various spin arrangements and cation distributions of Mg and Fe in the spinel lattice. Our results indicate that MgFe₂O₄ adopts an inverted antiferromagnetic structure. We also show that the energy necessary to reduce the inversion degree from 1 to 0.875 is smaller than those provided by the thermal treatments usually applied for the growth of the samples, showing that the formation of metastable phases with inversion degrees smaller than 1 is plausible, in agreement with the experimental results. Hyperfine interactions properties at Fe sites were obtained and compared to Mössbauer spectroscopy measurements at 4 K and 300 K, enabling a detailed characterization of the local Fe environments and gives support to our structural and magnetic model for MgFe<sub>2</sub>O<sub>4</sub>. Based on the results obtained for the bulk calculations, different (001) MgFe<sub>2</sub>O<sub>4</sub> surface terminations were examined and we found that, after a strong surface reconstruction, the most stable termination is the one that exposes Mg, Fe, and O atoms. We show that the surface inversion degree predicted by DFT is lower than the bulk value, a result that is consistent with experimental results obtained in nanoparticles and that cationic inversion in the superficial layers plays a crucial role in the magnetic response of MgFe<sub>2</sub>O<sub>4</sub> nanoparticles and thin films.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173846"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035298","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 : 2026-03-01Epub Date: 2026-01-19DOI: 10.1016/j.jmmm.2026.173862
Yuxuan Ma , M.Q. Pang , C.M. Wang
We propose a scheme to generate nonlinear spin currents in the tilted two-dimensional Dirac materials with out-of-plane magnetization, which are completely decoupled from both nonlinear longitudinal and Hall charge currents. These spin currents can exist within the band gap, exhibiting intrinsic quantum metric characteristics where band tilt plays a crucial role. The hexagonal warping coefficient significantly enhances these nonlinear spin currents. Furthermore, warping modifies the magnitudes of other nonlinear spin conductivity components in both conduction and valence bands, notably generating an exceptionally large off-diagonal Drude-like spin conductivity. Both the magnitude and direction of an applied in-plane magnetic field provide effective control over the amplitude and even the sign reversal of these spin conductivities. Remarkably, the in-plane magnetic field can induce an extra pure nonlinear spin current component. This work advances our understanding of quantum geometric effects in nonlinear spin transport and opens new avenues for developing dissipationless spintronic devices based on Dirac materials.
{"title":"Tilt-induced nonlinear spin currents in gapped two-dimensional Dirac materials","authors":"Yuxuan Ma , M.Q. Pang , C.M. Wang","doi":"10.1016/j.jmmm.2026.173862","DOIUrl":"10.1016/j.jmmm.2026.173862","url":null,"abstract":"<div><div>We propose a scheme to generate nonlinear spin currents in the tilted two-dimensional Dirac materials with out-of-plane magnetization, which are completely decoupled from both nonlinear longitudinal and Hall charge currents. These spin currents can exist within the band gap, exhibiting intrinsic quantum metric characteristics where band tilt plays a crucial role. The hexagonal warping coefficient significantly enhances these nonlinear spin currents. Furthermore, warping modifies the magnitudes of other nonlinear spin conductivity components in both conduction and valence bands, notably generating an exceptionally large off-diagonal Drude-like spin conductivity. Both the magnitude and direction of an applied in-plane magnetic field provide effective control over the amplitude and even the sign reversal of these spin conductivities. Remarkably, the in-plane magnetic field can induce an extra pure nonlinear spin current component. This work advances our understanding of quantum geometric effects in nonlinear spin transport and opens new avenues for developing dissipationless spintronic devices based on Dirac materials.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173862"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035300","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}
Present work discusses the photocatalysis ability of a series of divalent transition metals (DTMs) -doped zinc sulfide (ZnS) nanoparticles. The effect of different DTMs ions on the structural, optical properties were evaluated using various characterization techniques such as X-ray diffraction (XRD), Transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FTIR), and UV–visible spectroscopy, and their photocatalysis behavior on methylene blue dye was investigated using UV irradiation. All the samples were prepared by microwave assisted synthesis route using citric acid as reducing agent. The analysis of phase and nanostructure confirmed the cubic phase of ZnS nanoparticles, with the particles exhibiting a spherical shape. The ZnS nanoparticles doped with transition metals exhibited a crystallite size that was comparatively smaller when contrasted with pure ZnS. The UV–Visible spectrums revealed that the prepared ZnS nanoparticles confirm the quantum confinement effect by a sharp peak around 415 nm. The photocatalysis degradation of an organic dye such as methylene blue (MB) by the pure and DTM doped ZnS nanoparticles shows that these act as photocatalysis under visible light irradiation. The DTM doped ZnS nanoparticles showed considerably improved photo-degradation of MB. Among these, Fe doped ZnS nanoparticles show the best photo-catalytic candidate as compared to Ni2+/Co2+/Mn2+ doped ZnS nanoparticles. Magnetization study showed enhanced magnetic moment in transition metal doped samples. This makes it a promising candidate for photo-catalysis for the degradation of dyes under visible light for various optoelectronic and dilute magnetic semiconductors devices.
{"title":"Probing the effect of divalent transition metals (Mn, Fe, co & Ni) dopants on ZnS nanoparticles with the enhanced photocatalytic and magnetic properties","authors":"Shraddha Agrawal , Jitendra Bahadur , Veerpratap Meena , Vikas Lahariya , Naveen Kumar Arkoti , Sunanda Vashisth , Aditya Tiwari , Dong-Won Kang","doi":"10.1016/j.jmmm.2026.173858","DOIUrl":"10.1016/j.jmmm.2026.173858","url":null,"abstract":"<div><div>Present work discusses the photocatalysis ability of a series of divalent transition metals (DTMs) -doped zinc sulfide (ZnS) nanoparticles. The effect of different DTMs ions on the structural, optical properties were evaluated using various characterization techniques such as X-ray diffraction (XRD), Transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FTIR), and UV–visible spectroscopy, and their photocatalysis behavior on methylene blue dye was investigated using UV irradiation. All the samples were prepared by microwave assisted synthesis route using citric acid as reducing agent. The analysis of phase and nanostructure confirmed the cubic phase of ZnS nanoparticles, with the particles exhibiting a spherical shape. The ZnS nanoparticles doped with transition metals exhibited a crystallite size that was comparatively smaller when contrasted with pure ZnS. The UV–Visible spectrums revealed that the prepared ZnS nanoparticles confirm the quantum confinement effect by a sharp peak around 415 nm. The photocatalysis degradation of an organic dye such as methylene blue (MB) by the pure and DTM doped ZnS nanoparticles shows that these act as photocatalysis under visible light irradiation. The DTM doped ZnS nanoparticles showed considerably improved photo-degradation of MB. Among these, Fe doped ZnS nanoparticles show the best photo-catalytic candidate as compared to Ni<sup>2+</sup>/Co<sup>2+</sup>/Mn<sup>2+</sup> doped ZnS nanoparticles. Magnetization study showed enhanced magnetic moment in transition metal doped samples. This makes it a promising candidate for photo-catalysis for the degradation of dyes under visible light for various optoelectronic and dilute magnetic semiconductors devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173858"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074400","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}
The high entropized RT3 intermetallic compounds (R = rare-earth, T = 3d transition metal), which are designed by equiatomic ratios at R and T sites with high entropy ranging from 1.10R to 6.88R based on the thermodynamic theory of high entropy, are prepared by using arc melting and vacuum heat-treatment technology. The high entropized RT3 is verified to be a single phase by X-ray diffraction and Rietveld structural refinement. The high entropization not only can stabilize the unstable RFe3(R = light rare earth) phase, but also induces a magneto-crystalline anisotropy transition from easy axial to basal plane magnetizing direction. The high entropized RT3 intermetallic compounds exhibit hard magnetic characteristics with coercivity ranging from 6.12 kOe to 1.83 kOe at low temperature, with exception for soft magnetic Gd(Co1/3Fe1/3Ni1/3)3. The magnetizing curve of high entropized RT3 follows a mixed model of ferromagnetic and paramagnetic properties at room temperature, and the magnetization is significantly enhanced by the modulation of high entropized light rare earth at R site, which is due to the randomly site-dependent spin-arrangements of rare earth and transition metal, and thus can modulate the indirect 4f-3d exchange interaction. The magnetic properties of RT3 are improved by high entropization, and have the potential applications in hard magnetic devices, magnetic refrigeration, and magnetic modulated hydrogen storage.
{"title":"High entropy modulated structure and magnetic properties of RT3(R = rare earth; T = 3d transition metal) intermetallic compounds","authors":"Boyang Li, Yongquan Guo, Wei Liu, Yichen Feng, Xinze Wang, Wei Tang, Xinqi Ren","doi":"10.1016/j.jmmm.2026.173816","DOIUrl":"10.1016/j.jmmm.2026.173816","url":null,"abstract":"<div><div>The high entropized RT<sub>3</sub> intermetallic compounds (R = rare-earth, <em>T</em> = 3d transition metal), which are designed by equiatomic ratios at R and T sites with high entropy ranging from 1.10<em>R</em> to 6.88<em>R</em> based on the thermodynamic theory of high entropy, are prepared by using arc melting and vacuum heat-treatment technology. The high entropized RT<sub>3</sub> is verified to be a single phase by X-ray diffraction and Rietveld structural refinement. The high entropization not only can stabilize the unstable RFe<sub>3</sub>(R = light rare earth) phase, but also induces a magneto-crystalline anisotropy transition from easy axial to basal plane magnetizing direction. The high entropized RT<sub>3</sub> intermetallic compounds exhibit hard magnetic characteristics with coercivity ranging from 6.12 kOe to 1.83 kOe at low temperature, with exception for soft magnetic Gd(Co<sub>1/3</sub>Fe<sub>1/3</sub>Ni<sub>1/3</sub>)<sub>3</sub>. The magnetizing curve of high entropized RT<sub>3</sub> follows a mixed model of ferromagnetic and paramagnetic properties at room temperature, and the magnetization is significantly enhanced by the modulation of high entropized light rare earth at R site, which is due to the randomly site-dependent spin-arrangements of rare earth and transition metal, and thus can modulate the indirect 4<em>f</em>-3<em>d</em> exchange interaction. The magnetic properties of RT<sub>3</sub> are improved by high entropization, and have the potential applications in hard magnetic devices, magnetic refrigeration, and magnetic modulated hydrogen storage.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173816"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941256","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 : 2026-03-01Epub Date: 2026-01-11DOI: 10.1016/j.jmmm.2026.173813
Hanzhi Liu , Yibing Zhao , Jie Xu , Bokai Liang , Ying Jin , Changjun Jiang
The magnon-magnon coupling in single-layer patterned magnetic thin films holds promise for providing a theoretical foundation and guiding the development of low-power quantum information processing chips based on magnons. In this work, we designed and fabricated periodic arrays of CoFeB stripes. The pinning effect of stripe edges on magnetic moments leads to the excitation of the edge mode, whose dispersion relation exhibits degeneracy with that of the bulk mode, generating an anti-crossing gap that evolves regularly with magnetic field orientation. Furthermore, the hybridization frequency and coupling strength between the edge and bulk modes can be effectively modulated by adjusting the stripe width and thickness. This phenomenon primarily arises from the modulation of the stripe's shape anisotropy by geometric parameters, which consequently governs the magnetization components along different directions within the stripes under externally applied magnetic fields.
{"title":"Spin wave hybridization in periodic array of CoFeB stripes","authors":"Hanzhi Liu , Yibing Zhao , Jie Xu , Bokai Liang , Ying Jin , Changjun Jiang","doi":"10.1016/j.jmmm.2026.173813","DOIUrl":"10.1016/j.jmmm.2026.173813","url":null,"abstract":"<div><div>The magnon-magnon coupling in single-layer patterned magnetic thin films holds promise for providing a theoretical foundation and guiding the development of low-power quantum information processing chips based on magnons. In this work, we designed and fabricated periodic arrays of CoFeB stripes. The pinning effect of stripe edges on magnetic moments leads to the excitation of the edge mode, whose dispersion relation exhibits degeneracy with that of the bulk mode, generating an anti-crossing gap that evolves regularly with magnetic field orientation. Furthermore, the hybridization frequency and coupling strength between the edge and bulk modes can be effectively modulated by adjusting the stripe width and thickness. This phenomenon primarily arises from the modulation of the stripe's shape anisotropy by geometric parameters, which consequently governs the magnetization components along different directions within the stripes under externally applied magnetic fields.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"641 ","pages":"Article 173813"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975218","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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