Field-dependent anisotropic microwave responses in van der Waals ferromagnet Fe4GeTe2

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-06-09 DOI:10.1063/5.0268615

Wei Liu, Yuanxi Liang, Yang Yang, Jingjing Ma, Aina Wang, Azizur Rahman, Jingxin Li, Min Ge, Jiyu Fan, Chunlan Ma, Li Pi, Dongsheng Song, Haifeng Du, Zhe Qu, Lei Zhang

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引用次数: 0

Abstract

The exploration of two-dimensional van der Waals (2D-vdW) ferromagnets with high Curie temperature (TC) is crucial for the development of high-performance, non-volatile, and low-power spintronic devices. 2D-vdW Fe4GeTe2 (F4GT) is considered a promising candidate material due to its nearly room-temperature TC, strong magnetization, high conductivity, and variable magnetic anisotropy. In this study, we investigate the multiple magnetic couplings in F4GT single crystals using electron spin resonance (ESR) technique. ESR lines associated with the change from perpendicular magnetic anisotropy to easy plane anisotropy are observed, indicating strong anisotropic responses to the microwaves. As the temperature increases, the resonance lines for H∥ab shift toward higher fields, while those for H∥c move toward lower fields. These opposite behaviors are attributed to the competition between the inner magnetic field and the demagnetization effect. In addition, the angle-dependent ESR spectra of F4GT single crystal exhibit a [3 cos2(π2−φ)−1]2-like behavior, which indicates a characteristic of 2D magnetic coupling attributed to the dominant effects of q→ 0 mode. These findings provide significant insights into the complex spin couplings in F4GT and pave the way for its potential applications in microwave-based spintronic devices.

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范德华铁磁体Fe4GeTe2的场相关各向异性微波响应

探索具有高居里温度（TC）的二维范德华（2D-vdW）铁磁体对于开发高性能、非易失性和低功率自旋电子器件至关重要。2D-vdW Fe4GeTe2 （F4GT）由于其接近室温的TC、强磁化、高导电性和可变磁各向异性而被认为是一种很有前途的候选材料。在本研究中，我们利用电子自旋共振（ESR）技术研究了F4GT单晶中的多重磁耦合。观察到从垂直磁各向异性到平面磁各向异性变化的ESR谱线，表明了对微波的强各向异性响应。随着温度的升高，H∥ab的共振线向高场方向移动，而H∥c的共振线向低场方向移动。这些相反的行为归因于内部磁场和退磁效应之间的竞争。此外，F4GT单晶的角相关ESR谱表现为[3 cos2(π2−φ)−1]2-类行为，表明q→0模式主导作用下的二维磁耦合特性。这些发现为F4GT复杂的自旋耦合提供了重要的见解，并为其在微波自旋电子器件中的潜在应用铺平了道路。

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

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.