Spin-valve-like magnetoresistance in epitaxial Fe56Mn44 films

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-07-07 DOI:10.1016/j.jmmm.2025.173347

Yongzuo Wang , Ping Ma , Peng Chen, Xiaolin Li, Zhongjie Yan, Cunxu Gao

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Abstract

Benefiting from the advantages of antiferromagnets, such as external-field robustness, ultrafast dynamics, and stray-field-free characteristics, spin-dependent effects in antiferromagnets have garnered extensive attention. Here we report the observation of a spin-valve-like magnetoresistance in epitaxial prototype antiferromagnet Fe_xMn_100-x thin films, arising from spin-dependent scattering at interfaces between ferromagnetic clusters and the antiferromagnetic background. This magnetoresistance persists at room temperature and withstands magnetic field up to 70 kOe, owing to the pinning effect from the antiferromagnetic background. In contrast to conventional understanding that focuses on antisite disorder, our studies reveal that this phenomenon emerges only in nonstoichiometric Fe_xMn_100-x, while disappearing completely in the equiatomic Fe₅₀Mn₅₀ films. Our results provide opportunities for tailoring spin-dependent transport in antiferromagnets through precise composition control.

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外延Fe56Mn44薄膜的自旋阀样磁阻

得益于反铁磁体的外场鲁棒性、超快动力学和无杂散场特性等优点，反铁磁体中的自旋相关效应得到了广泛的关注。在这里，我们报告了在外延原型反铁磁薄膜FexMn100-x中观察到自旋阀状磁电阻，这是由铁磁团簇和反铁磁背景之间的界面上的自旋相关散射引起的。由于反铁磁背景的钉钉效应，这种磁电阻在室温下持续存在，并承受高达70 kOe的磁场。与传统的理解相反，我们的研究表明，这种现象只出现在非化学测量的femn100 -x中，而在等原子Fe50Mn50薄膜中完全消失。我们的结果提供了通过精确的成分控制来剪裁反铁磁体中自旋相关输运的机会。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.