准二维d波交变磁体的超高电荷自旋转换和隧穿磁阻

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2026-04-15 DOI:10.1063/5.0320570

Qing Zhang, Siyun Wang, Jianting Dong, Yurong Su, Jia Zhang

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引用次数: 0

摘要

交替磁体的出现推动了自旋电子学的突破性进展。值得注意的是，d波交替磁体支持非相对论性自旋输运、有效的电荷自旋转换和t奇自旋电流。此外，它们作为电极集成在反铁磁隧道结（AFMTJs）中，实现了隧道磁电阻（TMR）效应，允许对下一代存储器件的nsamel矢量进行电检测。在这项工作中，我们通过第一性原理计算研究了准二维（准2d） d波交替磁体kv2se20的非相对论性自旋输运性质以及基于kv2se20的afmtj中的TMR效应。结果表明，kv2se20在室温下具有非相对论性的纵向自旋极化和超过60%的自旋霍尔角，而基于kv2se20的afmtj的TMR比达到8.20 × 1013%，并且对费米能级位移保持稳健。这些发现突出了d波交错磁性固有的各向异性自旋极化，并强调了费米表面拓扑在增强afmtj中t -奇自旋输运和TMR效应中的关键作用。

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Ultrahigh charge-to-spin conversion and tunneling magnetoresistance in quasi-two-dimensional d -wave altermagnet

The emergence of altermagnets has driven groundbreaking advances in spintronics. Notably, d-wave altermagnets support non-relativistic spin transport, efficient charge-to-spin conversion, and T-odd spin currents. In addition, their integration as electrodes in antiferromagnetic tunnel junctions (AFMTJs) enables a tunneling magnetoresistance (TMR) effect, allowing electrical detection of Néel vectors for next-generation memory devices. In this work, we investigate the non-relativistic spin transport properties of the quasi-two-dimensional (quasi-2D) d-wave altermagnet KV2Se2O and the TMR effect in KV2Se2O-based AFMTJs via first-principles calculations. Our results reveal that KV2Se2O exhibits both non-relativistic longitudinal spin polarization and a spin Hall angle exceeding 60% at room temperature, while KV2Se2O-based AFMTJs achieve a giant TMR ratio of 8.20 × 1013%, which remains robust against Fermi-level shifts. These findings highlight the anisotropic spin polarization inherent to d-wave staggered magnetism and underscore the critical role of Fermi surface topology in enhancing T-odd spin transport and the TMR effect in AFMTJs.

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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.