Magnetic exchange interactions in room-temperature altermagnet KV2Se2O

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-09-29 DOI:10.1063/5.0285878

Jibin Li, Wangjiong Li, Yunzhen Hu, Xinhao Guo, Mingyi Chen, Shuwei Li, Xinman Chen, Shuxiang Wu

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引用次数: 0

Abstract

Altermagnets unify the merits of ferromagnets (strong magneto responses) and antiferromagnets (zero stray fields), demonstrating time-reversal symmetry breaking, intrinsic demagnetization effects, and terahertz-range spin dynamics. These unique properties have attracted significant attention for spintronic applications requiring both robust spin control and minimal magnetic interference. Recently, KV2Se2O was identified as a metallic room-temperature altermagnetic material, but the origin of its high magnetic transition temperature remains elusive. In this work, it was found that both antiferromagnetic and ferromagnetic exchange coupling jointly play a crucial role in achieving the high magnetic transition temperature. Furthermore, K atoms enhance the magnetic moments of V atoms through charge transfer, thereby enhancing magnetic exchange energy and elevating the magnetic transition temperature. Additionally, strain effects can modulate the magnetic properties and the magnetic transition temperature, highlighting their potential for tailoring altermagnetism. These results not only motivate further exploration of room-temperature altermagnets but also pave the way for optimizing KV2Se2O in future magnetic and spintronic nanodevices.

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室温交变磁体KV2Se2O中的磁交换相互作用

交替磁体结合了铁磁体（强磁振子响应）和反铁磁体（零杂散场）的优点，展示了时间反转对称性破缺、本征退磁效应和太赫兹范围自旋动力学。这些独特的性质引起了自旋电子学应用的极大关注，这些应用需要强大的自旋控制和最小的磁干扰。近年来，KV2Se2O被确定为一种金属室温变磁材料，但其高磁转变温度的来源仍然难以捉摸。在这项工作中，发现反铁磁和铁磁交换耦合在实现高磁转变温度中起着至关重要的作用。K原子通过电荷转移增强了V原子的磁矩，从而提高了磁交换能，提高了磁转变温度。此外，应变效应可以调节磁性和磁转变温度，突出了它们在定制电磁学方面的潜力。这些结果不仅激发了室温交替磁体的进一步探索，而且为优化KV2Se2O在未来磁性和自旋电子纳米器件中的应用铺平了道路。

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.