Journal of Magnetism and Magnetic Materials最新文献

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Structural, magnetic, and photocatalytic properties of Ce3+ ion doped NiZn ferrite nanoparticles Ce3+离子掺杂NiZn铁氧体纳米颗粒的结构、磁性和光催化性能

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-11 DOI: 10.1016/j.jmmm.2025.173671

Harita Kumari , Sourabh Sharma , Ashok Kumar , Rajesh Parmar , Poorva Rani , Priyanka Godara , Ram Mehar Singh , Richa Jain , Asha

This study utilized a hydrothermal method to synthesize Ni_0.5Zn_0.5Fe₂O₄ nanoparticles (NPs) doped with Ce³⁺ ions, marking a unique endeavour. Powder X-ray diffraction (XRD) analysis confirms the presence of a single-phase spinel structure across all samples. According to the Debye-Scherrer formula, the nanoparticles exhibit a crystallite size ranging from 7.5 to 6.41 nm. Distinctive vibrational bands at 458 cm⁻¹ and 501 cm⁻¹, corresponding to octahedral and tetrahedral sites, respectively, affirm the spinel structure's formation via Fourier transform infrared (FTIR) spectroscopy. High-resolution transmission electron microscopy (HRTEM) images indicate spherical grains with porous shapes and particle sizes ranging from 11 to 7 nm. The introduction of Ce dopant into Ni_0.5Zn_0.5Fe₂O₄ nanoparticles enhances their optical properties, evidenced by a considerable blue shift. When exposed to ultraviolet (UV) radiation, these particles showed exceptional catalytic activity, degrading 94% of a 10 ppm MB dye solution in 120 min. Even after undergoing four cycles, catalytic performance remains strong at 88%, highlighting exceptional structural stability attributed to increased adsorption capacity and effective separation of e⁻ - h⁺ pairs during light exposure. At room temperature, vibrating sample magnetometer (VSM) analysis reveals lower values for coercivity (H_C), remanence (M_r), and squareness (S), indicating that the synthesized ferrite samples are superparamagnetic. These findings will greatly accelerate the development of complex materials for long-term treatment of wastewater and spintronics applications. Furthermore, these nanoparticles show potential for a variety of applications, including high-frequency devices, targeted medication delivery, and ferrofluids.

本研究利用水热法合成了掺杂Ce3+离子的Ni0.5Zn0.5Fe2O4纳米粒子（NPs），是一项独特的尝试。粉末x射线衍射（XRD）分析证实了所有样品中存在单相尖晶石结构。根据Debye-Scherrer公式，纳米颗粒的晶粒尺寸在7.5到6.41 nm之间。在458 cm−1和501 cm−1的不同振动带，分别对应于八面体和四面体位置，通过傅里叶变换红外（FTIR）光谱证实了尖晶石结构的形成。高分辨率透射电镜（HRTEM）图像显示球形颗粒具有多孔形状，粒径范围为11 ~ 7 nm。在Ni0.5Zn0.5Fe2O4纳米粒子中引入Ce掺杂剂增强了纳米粒子的光学性能，表现为明显的蓝移。当暴露在紫外线（UV）辐射下时，这些颗粒表现出特殊的催化活性，在120分钟内降解10ppm MB染料溶液的94%。即使经过四个循环，催化性能仍然保持在88%，突出了特殊的结构稳定性，这归因于在光照下增加的吸附容量和e−- h+对的有效分离。在室温下，振动样品磁强计（VSM）分析显示，铁氧体样品的矫顽力（HC）、剩磁（Mr）和方正度(S)值较低，表明合成的铁氧体样品具有超顺磁性。这些发现将极大地加速用于长期处理废水和自旋电子学应用的复杂材料的发展。此外，这些纳米颗粒显示出各种应用的潜力，包括高频设备，靶向药物输送和铁磁流体。

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引用次数: 0

Non-linear magnetization and susceptibility of classical Heisenberg spin chains with arbitrary and different exchange 任意不同交换条件下经典海森堡自旋链的非线性磁化率和磁化率

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-11 DOI: 10.1016/j.jmmm.2025.173667

P.J. Cregg , Kieran Murphy

Interest in molecular magnets continues to grow, offering a link between atomic and nanoscale properties. The classical Heisenberg model has been effective in modelling exchange interactions in such systems. In this model, the magnetization and susceptibility are calculated through the partition function, where the Hamiltonian contains both Zeeman and exchange energy. For an ensemble of

N

spin sites, this requires integrals in 2

N

dimensions. Formulae for the non-linear (cubic) susceptibility are obtained from these integrals for two, three and four spin chains, expressed in terms of generalized Langevin functions. The benefit of incorporating the cubic terms is illustrated through simulations.

对分子磁体的兴趣持续增长，提供了原子和纳米级性质之间的联系。经典的海森堡模型在模拟这种系统中的交换相互作用方面是有效的。在该模型中，通过配分函数计算磁化率和磁化率，其中哈密顿量同时包含塞曼能和交换能。对于N个自旋位的集合，这需要2N维的积分。从二、三、四自旋链的积分中得到非线性（三次）磁化率的表达式，用广义朗之万函数表示。通过仿真说明了加入三次项的好处。

引用次数: 0

Structural and magnetic properties of Dy3+-doped BaTiO3 nanorods: A study of the tetragonal-to-cubic phase transition and emergent diluted magnetism Dy3+掺杂BaTiO3纳米棒的结构和磁性：四方向立方相变和紧急稀释磁性的研究

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-09 DOI: 10.1016/j.jmmm.2025.173658

Sandeep Kumar Singh Patel , Sandeep Kumar Chauhan , Amit Kumar , Simant Kumar Srivastav

Nanocrystalline pristine BaTiO₃ (BTO) and Dy³⁺-doped BaTiO₃ (Dy-BTO) nanorods were synthesized via the hydrothermal method. Structural and compositional analyses using XRD, TEM, XPS, and Raman spectroscopy confirmed the successful incorporation of Dy³⁺ ions into the BaTiO₃ lattice, with the formation of pure-phase nanorods. Dy³⁺ doping induced a structural phase transition from the tetragonal (P4mm) to the cubic (Pm

\bar{3}

m) symmetry, as verified by XRD and Raman results. XPS analysis further revealed that the valence mismatch between the dopant Dy³⁺ and the host Ba²⁺ leads to the creation of Ti³⁺ ions and oxygen vacancies in Dy-BTO. Magnetic characterization through M–H measurements showed that Dy-BTO exhibits an unsaturated hysteresis loop, indicating the coexistence of paramagnetic (PM) and ferromagnetic (FM) phases, while pristine BTO displays a combination of diamagnetic (DM) and FM behavior. The magnetic interactions were quantitatively analyzed using the bound magnetic polaron (BMP) model, which suggests that the formation of Dy³⁺–V_o–Dy³⁺ and Ti³⁺–V_o–Dy³⁺ centers plays a crucial role in mediating and stabilizing FM ordering. These findings highlight Dy-BTO nanorods as promising candidates for spintronic applications.

采用水热法制备了纯净BaTiO3 （BTO）纳米晶和掺杂Dy3+的BaTiO3 （Dy-BTO）纳米棒。利用XRD、TEM、XPS和拉曼光谱进行结构和成分分析，证实了Dy3+离子成功地结合到BaTiO₃晶格中，形成了纯相纳米棒。XRD和Raman结果证实，Dy3+掺杂诱导结构相变从四方（P4mm）到立方（Pm3¯m）对称。XPS分析进一步揭示了掺杂物Dy3+与宿主物Ba2+之间的价错导致了Dy-BTO中Ti3+离子和氧空位的产生。通过M-H测量的磁性表征表明，Dy-BTO表现出不饱和磁滞回线，表明顺磁（PM）和铁磁（FM）相共存，而原始BTO表现出抗磁（DM）和FM相的组合行为。利用结合磁极化子（BMP）模型定量分析了磁相互作用，表明Dy3+ -Vo-Dy3 +和Ti3+ -Vo-Dy3 +中心的形成在调节和稳定FM有序中起着至关重要的作用。这些发现突出了Dy-BTO纳米棒作为自旋电子学应用的有前途的候选者。

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引用次数: 0

Spin-dependent transport studies of Fe/MoxCr1-xS2/Fe magnetic tunnel junction Fe/MoxCr1-xS2/Fe磁性隧道结的自旋相关输运研究

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-08 DOI: 10.1016/j.jmmm.2025.173652

Aloka Ranjan Sahoo , Sharat Chandra

Using Density functional theory and non-equilibrium Green's function formalism, spin-dependent electron transport in Fe/Mo_xCr_1-xS₂/Fe magnetic tunnel junction is studied. Spin-transport for different thicknesses (1, 3, 5, and 7 layers) of the spacer MoS₂ and for two different surface orientations of the Fe electrode, the Fe(001) and Fe(111) surface and with substitutional doping of 3d transition metal Cr at Mo site in MoS₂ is investigated. The electronic structure of the heterostructure shows the presence of metal-induced states in the semiconducting MoS₂ at the Fe/MoS₂/Fe interface. The I-V characteristics of the junctions for the monolayer and three-layer MoS₂ spacer show linear behaviour due to the metallic nature of the junction. The tunnelling nature of the junction is observed for the thicker junctions with five-layer and seven-layer spacers. With the introduction of magnetic impurity Cr, the tunnelling magnetoresistance for 7-layer junction is reduced. The Cr-defect states are observed below the conduction band, and the Cr-doped devices are stable up to a bias of 0.5 V. Spin-transport through close-packed Fe(111) surface as electrode show low GMR value.

利用密度泛函理论和非平衡格林函数形式，研究了Fe/MoxCr1-xS2/Fe磁性隧道结中自旋相关的电子输运。研究了不同厚度（1层、3层、5层和7层）的间隔层MoS2和两种不同表面取向的Fe电极Fe（001）和Fe（111）表面的自旋输运，以及在MoS2的Mo位点上取代掺杂三维过渡金属Cr的情况。异质结构的电子结构表明，半导体MoS2在Fe/MoS2/Fe界面处存在金属诱导态。由于结的金属性质，单层和三层MoS2间隔层结的I-V特性表现为线性行为。对于具有五层和七层间隔层的较厚结，观察到结的隧道性质。随着磁性杂质Cr的引入，降低了7层结的隧穿磁阻。在导带以下观察到cr缺陷态，并且在0.5 V的偏置下，cr掺杂器件是稳定的。自旋输运通过紧密堆积的Fe（111）表面作为电极表现出较低的GMR值。

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引用次数: 0

Enhanced thermal conductivity in hot-pressed La(Fe,Si)13Hy-AgCu magnetocaloric composites 热压La(Fe,Si)13Hy-AgCu磁热复合材料的热导率增强

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-07 DOI: 10.1016/j.jmmm.2025.173653

Juan Cheng , Caiyin You , Bo Li , Yaru Guo , Hao Pei , Pengyu Wang , Mohan Dai , Cuilan Liu

The efficiency of the magnetic refrigerator is not only concerned with the magnetocaloric effect of the material but also the thermal transport properties. In order to obtain good thermal conductivity, La_0.8Ce_0.2Fe_11.53Mn_0.17Si_1.3 alloy was hot pressed with small amount of Ag-Cu alloy with the content of 0.1, 0.2 and 1.0 wt.% at 1323 K under the pressure of 51 MPa for 30 min. The phase constitution, microstructure, magnetic properties, thermal conductive and the mechanical properties of the composites were investigated. La_0.8Ce_0.2Fe_11.53Mn_0.17Si_1.3H_y composited with 0.1 wt.% Ag-Cu exhibits the good thermal conductivity (8.3 W∙m^-1∙K^-1), large magnetic entropy change (12 J∙kg^-1∙K^-1) and excellent mechanical properties (215 MPa).

磁制冷机的效率不仅与材料的磁热效应有关，还与材料的热输运特性有关。为了获得良好的导热性，在1323 K条件下，用微量含量分别为0.1、0.2和1.0 wt.%的Ag-Cu合金在51 MPa压力下热压30 min，得到La0.8Ce0.2Fe11.53Mn0.17Si1.3合金。研究了复合材料的相组成、显微组织、磁性能、导热性能和力学性能。以0.1 wt.% Ag-Cu复合的La0.8Ce0.2Fe11.53Mn0.17Si1.3Hy具有良好的导热性（8.3 W∙m-1∙K-1）、较大的磁熵变（12 J∙kg-1∙K-1）和优异的力学性能（215 MPa）。

引用次数: 0

Simulation-based evaluation of temperature-dependent heating performance of Zn-Mn-Al ferrite nanoparticles for tumor hyperthermia 基于模拟的Zn-Mn-Al铁氧体纳米颗粒用于肿瘤热疗的温度依赖性加热性能评估

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-07 DOI: 10.1016/j.jmmm.2025.173656

Md Mostafezur Rahman , Shuai-Wen Ding , Mohanraj Kumar , Wei Zhang , Jih-Hsing Chang

Magnetic nanoparticles (MNPs) with temperature-dependent heating behavior offer a promising strategy for self-regulated magnetic induction hyperthermia (MIH) in cancer treatment. This study simulates the temperature-dependent heating performance of Al-doped Zn-Mn ferrite nanoparticles (Zn_0.5Mn_0.5Al_xFe_2-xO₄) in a human liver tumor model, using experimentally validated parameters from previous characterization. The model evaluates in-tumor heating under physiological conditions, focusing on temperature rise, spatial uniformity, and thermal stability. The results confirm that MNPs with lower Curie temperatures (T_C) offer better temperature control, while higher-T_C particles enable more efficient heating at reduced concentrations. Experimental validation using magnetic hydrogel phantoms demonstrated good agreement with simulation predictions, with temperature deviations within ±1.5 °C. These findings highlight the importance of incorporating temperature-dependent specific loss power (SLP) behavior for accurate modeling of hyperthermia outcomes and provide a practical framework for optimizing MNP selection and dosage for safe and effective treatment.

具有温度依赖加热行为的磁性纳米颗粒（MNPs）为自我调节磁感应热疗（MIH）在癌症治疗中提供了一种很有前途的策略。本研究模拟了al掺杂Zn-Mn铁氧体纳米颗粒（Zn0.5Mn0.5AlxFe2-xO4）在人类肝脏肿瘤模型中的温度依赖性加热性能，使用了先前表征的实验验证参数。该模型评估生理条件下的肿瘤内加热，重点关注温升、空间均匀性和热稳定性。结果证实，具有较低居里温度（TC）的MNPs可以更好地控制温度，而较高的TC颗粒可以在较低浓度下更有效地加热。使用磁性水凝胶模型的实验验证与模拟预测非常吻合，温度偏差在±1.5°C以内。这些发现强调了将温度相关的特定损失功率（SLP）行为纳入热疗结果精确建模的重要性，并为优化MNP的选择和剂量提供了一个实用的框架，以实现安全有效的治疗。

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引用次数: 0

Evaluating density-based topology optimization using different material interpolation schemes: Magnetic actuator design case study 使用不同材料插值方案评估基于密度的拓扑优化：磁致动器设计案例研究

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-07 DOI: 10.1016/j.jmmm.2025.173646

Mohamed Reda Mahmoud , Mohamed N. Ibrahim , Peter Sergeant

This study introduces the density-based topology optimization for a magnetic actuator comparing three material interpolation methods. The material interpolation approaches are: 1) rational approximation of material properties (RAMP), 2) uniform sequence material interpolation (USMI), and 3) solid isotropic material with penalization (SIMP). This study investigates the effects of each interpolation method on the performance of the density approach. As a case study, optimizing the design of a magnetic actuator is enabled by topology optimization to maximize the actuation force while limiting the material consumption. The results highlight the trade-off between the three material interpolation methods. The material interpolation schemes were evaluated using different values of the shape control parameter, which regulates the material transition from void to solid. The results reveal that the optimal values for the shape control parameter should be between 3 and 6 for all schemes. Moreover, it is found that the SIMP scheme provides the optimal design in terms of a maximum force, a small amount of intermediate material, and a small optimal design area compared to other methods.

介绍了一种基于密度的磁致动器拓扑优化方法，并对三种材料插值方法进行了比较。材料插值方法有：1)材料性能的有理逼近（RAMP）， 2)均匀序列材料插值（USMI）和3)固体各向同性材料惩罚（SIMP）。本研究探讨了每种插值方法对密度法性能的影响。以磁体作动器为例，通过拓扑优化实现磁体作动器的优化设计，使作动力最大化，同时限制材料消耗。结果突出了三种材料插值方法之间的权衡。利用不同的形状控制参数值对材料插值方案进行了评价，形状控制参数值调节了材料从空洞到固体的转变。结果表明，对于所有方案，形状控制参数的最优值应在3 ~ 6之间。此外，与其他方法相比，SIMP方案在最大力、少量中间材料和较小的优化设计面积方面提供了最优设计。

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引用次数: 0

First-principles study of structural stability and magnetic properties in Fe–Pd–In alloys Fe-Pd-In合金结构稳定性和磁性能的第一性原理研究

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-06 DOI: 10.1016/j.jmmm.2025.173649

Yasutomi Tatetsu , Kenshi Matsumoto , Ryota Sato , Toshiharu Teranishi

In this study, we investigate the structural stability and magnetic properties of Fe–Pd-based ternary alloys. First-principles calculations are employed to analyze the stability of the

Z

3-Fe₂Pd₆ structure with In substitution and to evaluate the magnetic anisotropy energy of

Z

3-Fe₂Pd₅In₁. This structural modification is attributed to the unique inter-element miscibility of In with Pd and its immiscibility with Fe, which stabilizes the

Z

3 phase. Furthermore, the enhanced magnetic coercivity observed in

Z

3-Fe₂Pd₅In₁ compared to the

L

1₂-FePd₃ phase highlights the potential of controlling atomic ordering and inter-element interactions to design novel functional materials. Our findings also demonstrate that the magnetic anisotropy energy is highly sensitive to the lattice parameters. While the ideal structure exhibits in-plane anisotropy, a small compressive strain on the

a

-axis can induce a switch to uniaxial anisotropy, providing a plausible explanation for the experimentally observed coercivity. These insights provide a deeper understanding of the relationship between atomic-scale structural changes and macroscopic magnetic properties, offering valuable guidelines for the development of advanced magnetic materials.

在本研究中，我们研究了fe - pd基三元合金的结构稳定性和磁性能。采用第一性原理计算分析了In取代的Z3-Fe2Pd6结构的稳定性，并计算了Z3-Fe2Pd5In1的磁各向异性能。这种结构的改变是由于In与Pd独特的元素间互溶性和它与Fe的不互溶性，从而稳定了Z3相。此外，与L12-FePd3相相比，Z3-Fe2Pd5In1相的矫顽力增强，突出了控制原子有序和元素间相互作用以设计新型功能材料的潜力。我们的发现还表明，磁各向异性能对晶格参数高度敏感。虽然理想结构呈现平面内各向异性，但a轴上的小压缩应变可以诱导转换为单轴各向异性，这为实验观察到的矫顽力提供了合理的解释。这些见解提供了对原子尺度结构变化与宏观磁性之间关系的更深入理解，为先进磁性材料的开发提供了有价值的指导。

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引用次数: 0

Corrigendum to “Non-local thermoelectric transport in multi-terminal quantum dot hybrid system” [J. Magn. Magn. Mater. 593 (2024) 171745 “多终端量子点混合系统中的非局域热电输运”的勘误[J]。粉剂。粉剂。Mater. 593 (2024) 171745

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-06 DOI: 10.1016/j.jmmm.2025.173627

Vrishali Sonar, Piotr Trocha

引用次数: 0

Tailoring crystal structure, magnetism and transport in Ga-doped Mn3Ge ga掺杂Mn3Ge的晶体结构、磁性和输运裁剪

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

Journal of Magnetism and Magnetic Materials

Pub Date : 2025-11-06 DOI: 10.1016/j.jmmm.2025.173654

Hongmei Qiu, Jieqiong Cheng, Xuanhe Fu, Zhuhong Liu

The structural, magnetic, and electronic transport properties of Mn_3.05Ge_0.95-xGa_x (x = 0, 0.1, 0.2, 0.45) are systematically investigated across tetragonal and hexagonal crystallographic phases. The tetragonal phase, obtained through low-temperature annealing, exhibits ferrimagnetic behavior with non-saturating magnetization up to 50 kOe. A significant enhancement of coercivity (e.g., from 2.83 kOe in bulk to 14.99 kOe for x = 0) is achieved in melt-spun ribbons due to grain refinement. This enhanced coercivity is preserved upon Ga substitution, remaining high at 13.12 kOe for x = 0.45. These ribbon alloys display metallic conduction, with resistivity primarily governed by electron-magnon scattering between 10 K and 110 K and by electron-phonon scattering from 110 K to 350 K. High temperature annealing yields a predominantly antiferromagnetic D0₁₉ type hexagonal phase. In this phase, an increase in Curie temperature is observed with increasing Ga content. For x = 0.45, a slight spin canting towards the c-axis below 80 K gives rise to an uncompensated net magnetic moment. Transport studies reveal a typical anomalous Hall effect (AHE) in the hexagonal phase. Conduction is hole-dominated in Mn_3.05Ge_0.85Ga_0.1, but electron-dominated in Mn_3.05Ge_0.5Ga_0.45. In contrast, Mn_3.05Ge_0.95 shows a carrier type transition from holes to electrons. The electron-dominated transport in Mn_3.05Ge_0.5Ga_0.45 results in the AHE curves that differ in shape from those of Mn_3.05Ge_0.95 and Mn_3.05Ge_0.85Ga_0.1. This study elucidates the correlation between crystal structure, magnetic ordering, and transport behavior. The experimental results provide a valuable reference for the design and performance optimization of novel magnetic materials.

系统地研究了Mn3.05Ge0.95-xGax （x = 0,0.1, 0.2, 0.45）在四方和六方晶相上的结构、磁性和电子输运性质。通过低温退火得到的四方相表现出铁磁行为，非饱和磁化强度高达50 kOe。由于晶粒细化，熔融纺丝带的矫顽力显著增强（例如，x = 0时矫顽力从2.83 kOe增加到14.99 kOe）。这种增强的矫顽力在Ga取代后保持不变，当x = 0.45时，矫顽力保持在13.12 kOe。这些带状合金表现出金属导电性，其电阻率主要由10 K至110 K之间的电子-磁振子散射和110 K至350 K之间的电子-声子散射决定。高温退火制得以反铁磁性为主的D019型六方相。在这一阶段，随着Ga含量的增加，居里温度升高。当x = 0.45时，在80k以下向c轴倾斜的轻微自旋会产生未补偿的净磁矩。输运研究揭示了六方相中典型的反常霍尔效应（AHE）。在Mn3.05Ge0.85Ga0.1中以空穴为主，而在Mn3.05Ge0.5Ga0.45中以电子为主。相反，Mn3.05Ge0.95表现出从空穴到电子的载流子型转变。Mn3.05Ge0.5Ga0.45中的电子主导输运导致的AHE曲线形状与Mn3.05Ge0.95和Mn3.05Ge0.85Ga0.1不同。本研究阐明了晶体结构、磁有序和输运行为之间的关系。实验结果为新型磁性材料的设计和性能优化提供了有价值的参考。

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