Journal of Magnetism and Magnetic Materials最新文献

Multicaloric response and anisotropy-driven compensation switching in a solid hexagonal core–shell mixed-spin (7/2, 3/2) Ising nanowire 固体六方核壳混合自旋（7/ 2,3 /2）Ising纳米线的多色响应和各向异性驱动的补偿开关

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-08-20 DOI: 10.1016/j.jmmm.2026.174521

Aqeel Raad Ghafel

Multicaloric driving — the simultaneous or sequential use of two thermodynamically distinct stimuli — has been applied to magnetostructural alloys and to multiferroic oxides, but not, to our knowledge, to a mixed-spin ferrimagnetic nanostructure, whose caloric analysis has so far stopped at the field-driven entropy change. That is the gap addressed here. A solid hexagonal core–shell nanowire built from nineteen atomic columns — a central column and a hexagonal ring of six, all of spin 7/2 (a Gd³⁺-like core), surrounded by twelve columns of spin 3/2 (a Cr³⁺-like shell) — is described by a mixed-spin Blume–Capel Hamiltonian and solved within the Bogoliubov–Peierls variational mean-field approximation. The geometry is engineered so that the sublattice moments nearly cancel, M(0) = +0.342, guaranteeing a compensation temperature t_comp = 3.489 below the ordering temperature t_C = 5.404. Treating the core single-ion anisotropy as a second caloric stimulus alongside the magnetic field, we compute the isothermal entropy changes of field-only, anisotropy-only, and combined protocols, the adiabatic temperature changes, the order-of-operations (sequential) decomposition, and the RCP and TEC(10) figures of merit. Two qualitative results emerge. First, the synergy function Λ(t) separating the combined response from the sum of the individual ones changes sign discontinuously inside the compensation region, at the field-driven first-order reversal that occurs at t = 3.27, revealing an antagonistic-to-cooperative crossover anchored there. Second, the core anisotropy acts as a two-sided on/off switch for compensation itself: a compensation point exists only for −0.40 ≤ d_A ≤ +0.35, being pushed to zero temperature at the lower edge and absorbed into t_C at the upper one, while t_C varies by only about 15% across the whole range. Multicaloric operation yields the largest adiabatic temperature change (ΔT_ad = +3.60 against +1.93 and + 1.50 for the single stimuli) and the best broadband figure of merit, TEC(10) = 0.135 k_B per site, while peak-based measures remain dominated by the anisotropy channel alone (RCP = 1.158 against 1.151 and 0.339).

多色驱动——同时或连续使用两种不同的热力学刺激——已经应用于磁结构合金和多铁性氧化物，但据我们所知，还没有应用于混合自旋铁磁纳米结构，其热量分析迄今为止停留在场驱动的熵变上。这就是这里要解决的差距。一个实心的六边形核壳纳米线由19个原子柱组成——一个中心柱和一个六边形环，所有的自旋都是7/2（类似Gd3+的核），周围是12列自旋3/2（类似Cr3+的壳）——用混合自旋布鲁姆-卡佩尔哈密顿量来描述，并用Bogoliubov-Peierls变分平均场近似来求解。几何设计使子格矩几乎抵消，M(0) = +0.342，保证补偿温度tcomp = 3.489低于订购温度tC = 5.404。将核心单离子各向异性作为磁场的第二个热量刺激，我们计算了仅场、仅各向异性和组合方案的等温熵变化、绝热温度变化、操作顺序（顺序）分解以及RCP和TEC（10）的优点数字。两个定性结果出现了。首先，在t = 3.27处发生的场驱动一阶反转处，将组合响应与单个响应之和分离的协同函数Λ(t)在补偿区域内不连续地改变符号，揭示了锚定在此的对抗-合作交叉。其次，磁芯各向异性本身作为补偿的双向开/关开关：补偿点仅在−0.40 ≤ dA ≤ +0.35时存在，下边缘被推至零温度，上边缘被tC吸收，而tC在整个范围内仅变化约15%。多色操作产生最大的绝热温度变化（ΔTad = +3.60对+1.93和 + 1.50的单一刺激）和最佳宽带值，TEC（10） = 0.135 kB每个站点，而基于峰的测量仍然由各向异性通道单独支配（RCP = 1.158对1.151和0.339）。

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引用次数: 0

Structure, morphology and magnetic properties of FeBO3 nanoparticles obtained by bead milling 球磨法制备FeBO3纳米颗粒的结构、形貌和磁性能

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-05-21 DOI: 10.1016/j.jmmm.2026.174256

N.I. Snegirev , I.S. Lyubutin , S.S. Starchikov , M.A. Chuev , N.K. Chumakov , R.D. Svetogorov , O.M. Zhigalina , D.N. Khmelenin , S.V. Yagupov , M.B. Strugatsky

The structure, morphology, and magnetic properties of FeBO₃ nanoparticles obtained by bead milling were studied using a number of experimental methods. The resulting nanoparticles were found to be single-phase and free of chemical impurities. The most probable nanoparticle size, determined by transmission electron microscopy, is in the range of 40–60 nm. A broad particle size distribution is observed, with average sizes of 207 and 172 nm for different samples. Measurements of magnetization showed that with a decrease in the average particle size, the magnitude of remanent magnetization decreases significantly, while the width of the hysteresis loop increases.

The Mössbauer spectra of FeBO₃ nanoparticles are a superposition of a clearly (well) resolved magnetic sextet and a paramagnetic doublet, which is atypical for bulk iron borate crystals. The temperature dependence of the Mössbauer spectra is described within the framework of a many-state relaxation model of magnetic dynamics for antiferromagnetic nanoparticles.

采用多种实验方法研究了球磨法制备的FeBO3纳米颗粒的结构、形貌和磁性能。所得到的纳米颗粒是单相的，不含化学杂质。通过透射电子显微镜测定，最可能的纳米颗粒尺寸在40-60 nm范围内。粒径分布广泛，不同样品的平均粒径为207和172 nm。磁化强度测量结果表明，随着平均粒径的减小，剩余磁化强度显著减小，磁滞回线宽度增大。FeBO3纳米颗粒的Mössbauer光谱是清晰（良好）分辨的磁六偶体和顺磁双偶体的叠加，这对于块状硼酸铁晶体来说是不典型的。在反铁磁性纳米粒子的多态弛豫模型的框架内描述了Mössbauer光谱的温度依赖性。

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引用次数: 0

Pentagon domains in FeGa alloys FeGa合金中的五角形畴

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-04-01 Epub Date: 2026-02-09 DOI: 10.1016/j.jmmm.2026.173921

Yu U. Wang , Matthew N. Tianen , Rudolf Schäfer , Yongmei M. Jin

This paper reports Bitter method observations of pentagon-shaped magnetic domains on the surface of an FeGa single crystal. These domains intersect parallel Landau-Lifshitz-type domains, termed herein banded domains. The pentagon domains are shown to exhibit peculiar segmented zigzag boundaries distinct from the well known 180° V-lines of the banded domains. To analyze the micromagnetic structure of pentagon domains, domain responses to a perpendicular magnetic field are examined. In particular, the magnetization directions of the pentagon domains and adjacent banded domains are determined via the perpendicular magnetic field-induced spike domain configurations. The subsurface structure of the pentagon domains is then inferred, revealing that the segmented zigzag boundaries actually consist of four types of 90° V-lines. These findings based on the Bitter observations are subsequently verified using the Kerr microscopy technique. The coexistence of 90° V-lines and 180° V-lines as two types of zigzag boundaries in FeGa further clarifies the origin of zigzag boundaries, which lies at the heart of a significant scientific controversy regarding the magnetic domain phenomena in Fe-based magnetostrictive materials.

本文报道了用苦法观测FeGa单晶表面的五边形磁畴。这些结构域相交于平行的朗道-利夫希兹型结构域，在此称为带状结构域。五边形畴显示出特殊的分段之字形边界，与带状畴的180°v线不同。为了分析五边形畴的微磁结构，研究了垂直磁场下的畴响应。特别地，五边形畴和相邻带状畴的磁化方向是通过垂直磁场诱导的尖峰畴结构确定的。然后推断五边形域的地下结构，揭示了分割的之字形边界实际上由四种90°v线组成。这些发现基于苦的观察结果，随后使用克尔显微镜技术进行验证。90°v线和180°v线作为两种之字形边界的共存，进一步阐明了之字形边界的起源，这是铁基磁致伸缩材料中磁畴现象的一个重大科学争议的核心。

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引用次数: 0

Improved Dy diffusion efficiency and coercivity in sintered Nd0.5Ce0.5-Fe-B magnets by two-step grain boundary diffusion with PrYCu and DyH PrYCu和DyH两步晶界扩散提高了Nd0.5Ce0.5-Fe-B烧结磁体的Dy扩散效率和矫顽力

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-04-01 Epub Date: 2026-02-11 DOI: 10.1016/j.jmmm.2026.173871

Jiamin Wang , Guangfei Ding , Zexuan Wang , Yuheng Xie , Shuai Cao , Xiao Yang , Binhong Zhang , Bo Zheng , Hao Huang , Shuai Guo , Renjie Chen , Shenglei Che , Aru Yan

A novel two-step grain boundary diffusion approach utilizing PrYCu and DyH was employed on the sintered NdCe-Fe-B magnets (50 wt% Nd substituted by Ce). The coercivity of the two-step diffusion magnet reached 16.14 kOe, much higher than the magnet with only DyH diffusion (12.68 kOe). The coercivity enhancement was more distinct than that in conventional Dy/Tb diffused high-Ce magnets and enhanced thermal stability significantly. Microstructural and compositional analyses suggested that the pre-diffusion of PrYCu could form the Y-rich Ce-lean shell, which inhibited the Dy from diffusing into the interior of the grains during DyH diffusion. Instead, Dy trended to migrate into the deep interior of the magnets, accounting for the improved Dy diffusion efficiency and coercivity in the high Ce content magnet. Magnetic domain observation verified the strengthened demagnetization-resistance over a more extensive depth range. This work laid a foundation for the advancement of high-Ce content magnets with superior performance.

采用PrYCu和DyH两步晶界扩散方法对烧结钕铁硼磁体（Nd取代Ce为50%）进行了研究。两步扩散磁体的矫顽力达到16.14 kOe，远高于仅进行DyH扩散的磁体（12.68 kOe）。与传统的Dy/Tb扩散高ce磁体相比，其矫顽力增强更为明显，热稳定性显著提高。显微组织和成分分析表明，PrYCu的预扩散可以形成富y的Ce-lean壳层，从而抑制了DyH扩散过程中Dy向晶粒内部扩散。相反，Dy倾向于迁移到磁体的内部深处，这是高Ce含量磁体中Dy扩散效率和矫顽力提高的原因。磁畴观测证实了在更大的深度范围内增强的抗退磁能力。该工作为高性能高含铈磁体的发展奠定了基础。

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引用次数: 0

Carrier doping modulates magnetism and valley polarization in MnPX3 (X = S, Se and Te) monolayer 载流子掺杂调制MnPX3 （X = S， Se和Te）单层的磁性和谷极化

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-04-01 Epub Date: 2026-02-11 DOI: 10.1016/j.jmmm.2026.173880

Changwei Wu, Weiping Gong, Yun Xie, Jianming Deng

In recent years, valley-contrasting physics in 2D magnetic materials has attracted significant attention in fundamental sciences and emerging information technology. Here, using first-principles calculations, we explore the effects of carrier doping on the magnetism and valley polarization in MnPX

_{3}

(X = S, Se, Te) monolayers. The MnPX

_{3}

monolayers host intrinsic Néel antiferromagnetic (AFM-N) states with in-plane anisotropy and exhibit valley polarization between

K

and

- K

. Moreover, a series of magnetic state diagrams of MnPX

_{3}

(X = S, Se and Te) monolayers are achieved under carrier doping. Interestingly, appropriate electron doping induces a reorientation of the easy magnetization axis to out-of-plane in the MnPTe

_{3}

monolayer, thereby realizing spontaneous valley polarization and the anomalous valley Hall effect. Above a doping concentration of 0.2 carriers per unit cell, the MnPTe

_{3}

monolayer transitions into a ferromagnetic half-metallic state. Those findings further unveil that MnPX

_{3}

(X = S, Se and Te) monolayers are promising valley materials for developing valleytronic and spintronic devices.

近年来，二维磁性材料中的谷对比物理在基础科学和新兴信息技术领域引起了极大的关注。本文利用第一性原理计算，探讨了载流子掺杂对MnPX3 （X = S, Se, Te）单层磁性和谷极化的影响。MnPX3单层具有面内各向异性的内禀反铁磁（AFM-N）态，在K和−K之间表现出谷极化。此外，在载流子掺杂下，获得了MnPX3 （X = S， Se和Te）单层的一系列磁态图。有趣的是，适当的电子掺杂诱导了MnPTe3单层中易磁化轴向面外取向，从而实现了自发谷极化和反常谷霍尔效应。当掺杂浓度为0.2个载流子/电池时，MnPTe3单层转变为铁磁半金属态。这些发现进一步揭示了MnPX3 （X = S， Se和Te）单层膜是开发谷电子和自旋电子器件的有前途的谷材料。

{"title":"Carrier doping modulates magnetism and valley polarization in MnPX3 (X = S, Se and Te) monolayer","authors":"Changwei Wu, Weiping Gong, Yun Xie, Jianming Deng","doi":"10.1016/j.jmmm.2026.173880","DOIUrl":"10.1016/j.jmmm.2026.173880","url":null,"abstract":"<div><div>In recent years, valley-contrasting physics in 2D magnetic materials has attracted significant attention in fundamental sciences and emerging information technology. Here, using first-principles calculations, we explore the effects of carrier doping on the magnetism and valley polarization in MnPX<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> (X = S, Se, Te) monolayers. The MnPX<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> monolayers host intrinsic Néel antiferromagnetic (AFM-N) states with in-plane anisotropy and exhibit valley polarization between <span><math><mi>K</mi></math></span> and <span><math><mrow><mo>−</mo><mi>K</mi></mrow></math></span>. Moreover, a series of magnetic state diagrams of MnPX<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> (X = S, Se and Te) monolayers are achieved under carrier doping. Interestingly, appropriate electron doping induces a reorientation of the easy magnetization axis to out-of-plane in the MnPTe<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> monolayer, thereby realizing spontaneous valley polarization and the anomalous valley Hall effect. Above a doping concentration of 0.2 carriers per unit cell, the MnPTe<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> monolayer transitions into a ferromagnetic half-metallic state. Those findings further unveil that MnPX<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> (X = S, Se and Te) monolayers are promising valley materials for developing valleytronic and spintronic devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"643 ","pages":"Article 173880"},"PeriodicalIF":3.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187598","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}

引用次数: 0

Influence of preparation method on magnetic properties and martensitic transformations of ferromagnetic MnCoGe alloys 制备方法对铁磁MnCoGe合金磁性能和马氏体相变的影响

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-04-01 Epub Date: 2026-02-06 DOI: 10.1016/j.jmmm.2026.173914

Taisei Tsunematsu , Masahira Onoue , Yoshifuru Mitsui , Rie Y. Umetsu , Keiichi Koyama

Preparation method of ferromagnetic MnCoGe mother alloys influenced the martensitic transformation temperatures. It was found that the martensitic transformation disappeared when MnCoGe was prepared by the solid-phase reactive sintering (SPRS) method. From microstructure, there were many large voids and Ge-poor phase existed around the voids. It is revealed by ⁵⁷Fe Mössbauer spectra of SPRS Fe-substituted MnCoGe that SPRS did not influence the atomic order of MnCoGe phase. The large porosity of the compact, distribution of Ge-poor precipitate, deviation from stoichiometry of the matrix phase, and lattice shrink of parent phase contribute to the disappearance of martensitic transformation of MnCoGe alloys.

铁磁MnCoGe母合金的制备方法对马氏体相变温度有影响。采用固相反应烧结（SPRS）法制备MnCoGe时，马氏体相变消失。从微观结构上看，孔洞周围存在许多大孔洞，且存在Ge-poor相。通过对SPRS的57Fe Mössbauer光谱分析发现，SPRS对MnCoGe相的原子顺序没有影响。致密体的大孔隙率、贫锗析出物的分布、基体相的化学计量偏离以及母相的晶格收缩是导致MnCoGe合金马氏体相变消失的主要原因。

引用次数: 0

Pressure-induced magnetic transition in the quasi one-dimensional quantum halide CsTiI3 准一维量子卤化物CsTiI3的压力感应磁跃迁

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-04-01 Epub Date: 2026-02-12 DOI: 10.1016/j.jmmm.2026.173882

Jorge M. Osorio-Guillén , John A. Vélez-Vélez , Juan C. Alvarez-Quiceno , Gustavo M. Dalpian

Halide perovskites, such as CsPbI

_{3}

, are well-known as semiconductors for optoelectronic applications. However, this diverse family of compounds can also exhibit a range of unexplored physical properties, including those of quantum materials. We conducted a quantum mechanical study of CsTiI

_{3}

to investigate its potential as a quantum material. Our calculations reveal complex magnetic interactions that are highly tunable by external pressure. We found that CsTiI

_{3}

undergoes a series of pressure-induced phase transitions: from a linear-chain ferromagnetic (FM) half-metal to an antiferromagnetic (AFM) metal at 6.5 GPa. At even higher pressures, the titanium (Ti) magnetic moment is quenched, leading to a transition to a non-magnetic (NM) metallic state. The ferromagnetic to antiferromagnetic phase transition is explained by the 90 ° superexchange model, where the behavior of the intrachain magnetic coupling is governed by the value of the angle within the I–Ti–I chain. This discovery of pressure-tunable magnetism in CsTiI

_{3}

highlights the unexplored potential of halide perovskites for novel quantum phenomena.

卤化物钙钛矿，如CsPbI3，是众所周知的光电应用半导体。然而，这种不同的化合物家族也可以表现出一系列未被探索的物理性质，包括量子材料的物理性质。我们对CsTiI3进行了量子力学研究，以研究其作为量子材料的潜力。我们的计算揭示了复杂的磁相互作用是高度可调的外部压力。我们发现CsTiI3在6.5 GPa时经历了一系列压力诱导的相变：从线性链铁磁（FM）半金属到反铁磁（AFM）金属。在更高的压力下，钛（Ti）磁矩被淬灭，导致过渡到非磁性（NM）金属态。铁磁到反铁磁的相变可以用90°超交换模型来解释，其中链内磁耦合的行为由I-Ti-I链内角度的值决定。CsTiI3中压力可调磁性的发现突出了卤化物钙钛矿在新量子现象中的未开发潜力。

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引用次数: 0

Probing the impact of the inclusion of NiFe2O4 on the structural and magnetic properties of LaSrBiMnO3 ceramics 探讨NiFe2O4包合物对LaSrBiMnO3陶瓷结构和磁性能的影响

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-04-01 Epub Date: 2026-02-09 DOI: 10.1016/j.jmmm.2026.173911

Shekhar Kumar , Md. Kashif Shamim , Divya Kumari , Shaishtah Naaz , Kavita Verma , Nisha Kumari , Ruchi Rashmi , Seema Sharma

Polycrystalline samples of (1-x)La_0.4Sr_0.3Bi_0.3MnO₃-(x)NiFe₂O₄ (LSBMO-NFO) (x = 0.01, 0.02, 0.03 and 0.04) ceramics were planetary ball milled and synthesized by conventional solid state sintering method. The emphasis of this study was to explore the structure and magnetic properties of LSBMO-NFO as a function of increasing NFO content. Structural characterization was conducted using X-ray diffraction (XRD) and Raman spectroscopy. Rietveld refinement of the XRD data was employed to quantify the structural parameters, confirms the coexistence of orthorhombic and cubic phases phase, while the individual phase fractions adhered to the stoichiometric proportions of the chemical compositions. Moreover, with increasing NFO content, both the phase fraction and unit cell volume of the orthorhombic phase exhibited a gradual reduction. While Lorentzian fitted Raman spectra complemented the XRD findings. Further chemical state evaluated from X-ray photoelectron spectroscopy (XPS) confirms that Fe and Mn were present in 3+ and 4+ mixed states respectively. Reduction in Mn⁴⁺ ratio and increase in Fe⁴⁺ ratio was found to increase with increase in NFO percentage. Field dependent room temperature magnetic study revealed canted antiferromagnetic nature, while the temperature-dependent magnetization studies of LSBMO-NFO compounds reveal a complex magnetic behavior driven by the interplay of long-range ferromagnetic and short-range spin correlations.

采用行星球磨法合成了（1-x）La0.4Sr0.3Bi0.3MnO3-(x)NiFe2O4 (LSBMO-NFO) （x = 0.01, 0.02, 0.03和0.04）多晶陶瓷样品。本研究的重点是探索LSBMO-NFO的结构和磁性能随NFO含量的增加而变化。利用x射线衍射（XRD）和拉曼光谱对其进行了结构表征。采用Rietveld细化的XRD数据量化了结构参数，证实了正交相和立方相共存，而单个相分数则遵循化学成分的化学计量比例。随着NFO含量的增加，正交相分数和晶胞体积均呈逐渐减小的趋势。而洛伦兹拟合拉曼光谱则与XRD结果相辅相成。x射线光电子能谱（XPS）进一步评价了Fe和Mn分别以3+和4+混合态存在。Mn4+比的降低和Fe4+比的增加随着NFO含量的增加而增加。磁场相关的室温磁性研究揭示了倾斜的反铁磁性，而温度相关的磁化研究揭示了lssmo - nfo化合物的复杂磁性行为是由远程铁磁性和短程自旋相关相互作用驱动的。

{"title":"Probing the impact of the inclusion of NiFe2O4 on the structural and magnetic properties of LaSrBiMnO3 ceramics","authors":"Shekhar Kumar , Md. Kashif Shamim , Divya Kumari , Shaishtah Naaz , Kavita Verma , Nisha Kumari , Ruchi Rashmi , Seema Sharma","doi":"10.1016/j.jmmm.2026.173911","DOIUrl":"10.1016/j.jmmm.2026.173911","url":null,"abstract":"<div><div>Polycrystalline samples of (1-x)La<sub>0.4</sub>Sr<sub>0.3</sub>Bi<sub>0.3</sub>MnO<sub>3</sub>-(x)NiFe<sub>2</sub>O<sub>4</sub> (LSBMO-NFO) (x = 0.01, 0.02, 0.03 and 0.04) ceramics were planetary ball milled and synthesized by conventional solid state sintering method. The emphasis of this study was to explore the structure and magnetic properties of LSBMO-NFO as a function of increasing NFO content. Structural characterization was conducted using X-ray diffraction (XRD) and Raman spectroscopy. Rietveld refinement of the XRD data was employed to quantify the structural parameters, confirms the coexistence of orthorhombic and cubic phases phase, while the individual phase fractions adhered to the stoichiometric proportions of the chemical compositions. Moreover, with increasing NFO content, both the phase fraction and unit cell volume of the orthorhombic phase exhibited a gradual reduction. While Lorentzian fitted Raman spectra complemented the XRD findings. Further chemical state evaluated from X-ray photoelectron spectroscopy (XPS) confirms that Fe and Mn were present in 3+ and 4+ mixed states respectively. Reduction in Mn<sup>4+</sup> ratio and increase in Fe<sup>4+</sup> ratio was found to increase with increase in NFO percentage. Field dependent room temperature magnetic study revealed canted antiferromagnetic nature, while the temperature-dependent magnetization studies of LSBMO-NFO compounds reveal a complex magnetic behavior driven by the interplay of long-range ferromagnetic and short-range spin correlations.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"643 ","pages":"Article 173911"},"PeriodicalIF":3.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187617","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}

引用次数: 0

Evidence for reduced anti-site disorder and enhanced magnetic moments in Fe2VxCr1-xAl (0 ≤ x ≤ 1) Heusler compounds Fe2VxCr1-xAl(0≤x≤1)Heusler化合物中反位点紊乱减少和磁矩增强的证据

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-04-01 Epub Date: 2026-02-08 DOI: 10.1016/j.jmmm.2026.173913

A.S. Kamble , Keshav Sharma , C.S. Yadav , S.D. Kaushik

We report a comprehensive structural and magnetic study on the Fe₂V_xCr_1-xAl (x = 0, 0.25, 0.50, 0.75, 1) series of full Heusler compounds. Crystal structure of this series is analyzed by X-Ray Diffraction (XRD) and Neutron Powder Diffraction (NPD) at room temperature which reveal that the degree of anti-site disorder, particularly involving Fe, V/Cr, and Al atoms, systematically decreases with increasing vanadium concentration. This trend is identified through the evolution of superlattice reflections, notably the (111), (200) peaks. Magnetic measurements indicate a non-trivial evolution of the effective magnetic moment, with Fe₂CrAl (x = 0) exhibiting a higher moment than predicted by the Slater-Pauling rule, suggesting enhancement in the direct exchange between Fe atoms due to anti-site disorder. The results highlight the sensitivity of atomic ordering and magnetic behavior to compositional tuning in Fe-based Heusler compounds. The conventional Boltzmann framework cannot be used to describe the temperature dependent resistivity behavior of Fe₂V_xCr_1-xAl. Instead, the system exhibits a disorder-driven crossover from a pseudo-gapped semi-metallic state to an Anderson-localized regime, accompanied by significant contributions from spin-fluctuation scattering.

我们报道了Fe2VxCr1-xAl （x = 0,0.25, 0.50, 0.75, 1）系列完整Heusler化合物的结构和磁性的全面研究。室温下用x射线衍射（XRD）和中子粉末衍射（NPD）分析了该系列的晶体结构，结果表明，随着钒浓度的增加，反位无序程度，特别是Fe、V/Cr和Al原子的无序程度有系统地降低。这一趋势是通过超晶格反射的演变来确定的，特别是（111）、（200）峰。磁性测量表明，有效磁矩的变化是非平凡的，Fe2CrAl （x = 0）表现出比Slater-Pauling规则预测的更高的磁矩，表明由于反位无序，铁原子之间的直接交换增强。结果强调了铁基Heusler化合物的原子有序和磁性行为对组成调谐的敏感性。传统的玻尔兹曼框架不能用于描述Fe2VxCr1-xAl的温度相关电阻率行为。相反，该系统表现出从伪间隙半金属态到安德森局域态的无序驱动交叉，伴随着自旋涨落散射的显著贡献。

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引用次数: 0

Tailoring room-temperature ferromagnetism and magneto-transport in cuCr co-doped ZnS nanoparticles cuCr共掺杂ZnS纳米颗粒的室温铁磁性和磁输运裁剪

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials

Pub Date : 2026-03-15 Epub Date: 2026-01-29 DOI: 10.1016/j.jmmm.2026.173879

Prayas Chandra Patel , Yogendra Lal Verma , Swati Raman , Aditya Narayan Upadhyay

Transition metal co-doping has emerged as an effective strategy to tailor the magnetic and electronic properties of wide-bandgap semiconductors for spintronic applications. In this work, CuCr co-doped ZnS nanoparticles were synthesized via a simple wet-chemical precipitation method and systematically investigated for their structural, optical, magnetic, and transport properties. The nanoparticles crystallize in the cubic ZnS phase with defect-assisted absorption features, confirming successful dopant incorporation without secondary impurity phases. Optical measurements reveal bandgap tuning influenced by the combined action of Cu- and Cr-induced states. Magnetic characterization at room temperature demonstrates clear ferromagnetic hysteresis across all co-doped compositions, with the degree of ferromagnetism strongly dependent on the relative Cu:Cr ratio. Cu-rich samples exhibit enhanced saturation magnetization and soft ferromagnetic behaviour, while Cr-rich samples show reduced magnetization but increased coercivity due to competing antiferromagnetic interactions. Magneto-transport studies further reveal pronounced negative magnetoresistance, the magnitude of which correlates directly with the strength of ferromagnetic ordering. This behaviour is consistent with a bound magnetic polaron percolation mechanism mediated by sulfur-vacancy-induced carriers. The results establish CuCr co-doped ZnS as a promising diluted magnetic semiconductor where room-temperature ferromagnetism and spin-dependent transport can be engineered through controlled co-doping. The tunable balance between magnetic ordering, anisotropy, and negative magnetoresistance highlights the potential of this system for spintronic and multifunctional optoelectronic applications.

过渡金属共掺杂已成为一种有效的策略来定制自旋电子应用的宽带隙半导体的磁性和电子特性。在这项工作中，通过简单的湿化学沉淀法合成了CuCr共掺杂ZnS纳米粒子，并系统地研究了它们的结构、光学、磁性和输运性质。纳米颗粒在具有缺陷辅助吸收特征的立方ZnS相中结晶，证实了没有二次杂质相的成功掺杂。光学测量揭示了Cu和cr诱导态的共同作用对带隙调谐的影响。室温下的磁性表征表明，所有共掺杂成分都有明显的铁磁滞后，铁磁程度强烈依赖于相对Cu:Cr比。富cu样品表现出增强的饱和磁化和软铁磁行为，而富cr样品表现出磁化降低但由于竞争的反铁磁相互作用而增加矫顽力。磁输运研究进一步揭示了明显的负磁阻，其大小与铁磁有序的强度直接相关。这种行为符合由硫空位诱导的载流子介导的束缚磁极化子渗透机制。结果表明，CuCr共掺杂ZnS是一种很有前途的稀释磁性半导体，通过控制共掺杂可以设计室温铁磁性和自旋相关输运。磁有序、各向异性和负磁阻之间的可调平衡突出了该系统在自旋电子和多功能光电应用中的潜力。

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