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説明:

Spin Hall nano-oscillators (SHNOs) are emerging spintronic oscillators with significant potential for technological applications, including microwave signal generation, and unconventional computing. Despite their promising applications, SHNOs face various challenges, such as high energy consumption and difficulties in growing high-quality thin film heterostructures with clean interfaces. Here, single-layer topological magnetic Weyl semimetals open a possible solution as they possess both intrinsic ferromagnetism and a large spin–orbit coupling due to their topological properties. However, producing such high-quality thin films of magnetic Weyl semimetals that retain their topological properties and Berry curvature remains a challenge. We address these issues with high-quality single-layer epitaxial ferromagnetic Co2MnGa Weyl semimetal thin film-based SHNOs. We observe a giant spin Hall conductivity, σ_SHC = (6.08 ± 0.02) × 105 (ℏ/2e) Ω^–1 m^–1, which is an order of magnitude higher than previous reports. Theoretical calculations corroborate the experimental results with a large intrinsic spin Hall conductivity due to presence of a strong Berry curvature. Further, self spin-orbit torque driven magnetization auto-oscillations are demonstrated for the first time, at an ultralow threshold current density of J_th = 6.2 × 10^11 A m^–2. These findings indicate that magnetic Weyl semimetals have tremendous application potential for developing energy-efficient spintronic devices.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Magnetic Weyl Semimetal, Berry Curvature, Intrinsic Spin-orbit Torque , Spin Hall Nano-Oscillator, Magnetization Auto-Oscillation, Microfocused Brillouin Light Scattering

刊行年月日: 2025-05-20

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Nano (ISSN: 19360851) vol. 19 issue. 19 p. 18534-18544

研究助成金:

• Swedish Research Council 2016-05980
• Ministry of Electronics and Information technology 3149159
• European Commission 2021-05925
• European Commission 896307
• Japan Society for the Promotion of Science JP21H01608
• European Commission 835068 TOPSPIN

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acsnano.5c02048

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更新時刻: 2025-08-01 12:30:21 +0900

MDRでの公開時刻: 2025-08-01 12:18:18 +0900