用角度相关的x射线磁圆二色性研究了铁对l10 -有序FePt薄膜磁各向异性的贡献

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-10-07 DOI:10.1063/5.0283193

Goro Shibata, Keisuke Ikeda, Takeshi Seki, Shoya Sakamoto, Yosuke Nonaka, Zhendong Chi, Yuxuan Wan, Masahiro Suzuki, Tsuneharu Koide, Hiroki Wadati, Koki Takanashi, Atsushi Fujimori

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引用次数: 0

摘要

在具有垂直磁各向异性（PMA）的磁性薄膜中，l10 -有序FePt因其异常强的磁各向异性而备受关注。然而，其强PMA的微观起源尚未被实验阐明。我们通过在fel2,3边缘的角度依赖x射线磁圆二色性研究了Fe 3d电子对其磁各向异性能的贡献。利用该方法，可以推导出表征自旋极化电子各向异性空间分布的磁偶极矩mT和铁三维电子的轨道矩各向异性（OMA）。检测到的有限mT表明，自旋极化的Fe三维电子优先分布在薄膜的面外方向。这mT的Fe压倒了OMA对PMA的正贡献，并降低了l10 -有序FePt薄膜的PMA，与先前的第一性原理计算一致。目前的结果表明，非磁性元素Pt而不是Fe对l10 -有序FePt薄膜的PMA有很大的正向贡献。

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Fe contribution to the magnetic anisotropy of L10-ordered FePt thin films studied by angle-dependent x-ray magnetic circular dichroism

Among magnetic thin films with perpendicular magnetic anisotropy (PMA), L10-ordered FePt has attracted significant attention because of its exceptionally strong PMA. However, the microscopic origin of its strong PMA has not been elucidated experimentally. We have investigated the contribution of the Fe 3d electrons to its magnetic anisotropy energy by angle-dependent x-ray magnetic circular dichroism at the Fe L2,3 edge. By this technique, one can deduce the magnetic dipole moment mT, which represents the anisotropic spatial distribution of spin-polarized electrons, and the orbital moment anisotropy (OMA) of Fe 3d electrons. Detected finite mT indicates that the spin-polarized Fe 3d electrons are distributed preferentially in the out-of-plane direction of the films. This mT of Fe overwhelms the positive contribution of OMA to PMA and reduces the PMA of L10-ordered FePt thin films, consistent with a previous first-principles calculation. The present result implies that a large positive contribution of the non-magnetic element Pt rather than Fe governs the PMA of L10-ordered FePt thin films.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.