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説明:

The current-induced spin-orbit torque (SOT) at heavy metal/ferromagnet (HM/FM) interfaces plays a critical role in modern spintronics. In this study, the SOT efficiency is enhanced by engineering symmetrical structures, specifically by a wedge-shaped topological material interface in R3 ̅m Bi2Te3 (001)/FM heterostructures. The symmetry of the topological interface is manipulated to lead to unconventional emergences of both out-of-plane and in-plane spin polarizations. Torque measurements show that these polarizations have conversion efficiencies up to 10%. This considerable improvement in the SOT efficiency is characterized both qualitatively and quantitatively based on the nonreciprocal ferromagnetic resonance (FMR) spectra and the SOT dependence on the magnetic field direction. The observed enhancement in the unconventional SOT is attributed to the wedge-oriented symmetry reduction of the spin-momentum locking structure of interfacial Dirac fermions. This advance opens new avenues for designing geometrically novel spintronics devices, demonstrating the potential of using multidirectional SOTs for forthcoming nanotechnological applications.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: Spin-orbit torque, Topological Insulator, Nonreciprocal transport

刊行年月日: 2025-03-13

出版者: Springer Science and Business Media LLC

掲載誌:

• Communications Physics (ISSN: 23993650) vol. 8 issue. 1 100

研究助成金:

• MEXT | Japan Society for the Promotion of Science 24K00952
• MEXT | Japan Society for the Promotion of Science 20K14419
• MEXT | Japan Society for the Promotion of Science 22K03538
• MEXT | JST | Precursory Research for Embryonic Science and Technology JPMJPR18L3

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s42005-025-02024-1

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更新時刻: 2025-03-26 17:25:49 +0900

MDRでの公開時刻: 2025-03-26 17:25:50 +0900