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Green materials for efficient charge-to-spin conversion are desired for common spintronic applications. Recent studies have documented the efficient generation of spin torque using spin-orbit interactions (SOIs); however, SOI use relies on the employment of rare metals such as platinum. Here, we demonstrate that a nanometer-thick gradient from silicon to aluminum, which consists of readily available elements from earth resources, can produce a spin torque as large as that of platinum despite the weak SOI of these compositions. The spin torque efficiency can be improved by decreasing the thickness of the gradient, while a sharp interface was not found to increase the spin torque. Moreover, the electric conductivity of the gradient material can be up to twice as large as that of platinum, which provides a way to reduce Joule heating losses in spintronic devices.

権利情報:

• Creative Commons BY Attribution 4.0 International
  Copyright © 2025 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).

キーワード: spintronics

刊行年月日: 2025-05-09

出版者: American Association for the Advancement of Science (AAAS)

掲載誌:

• Science Advances (ISSN: 23752548) vol. 11 issue. 19

研究助成金:

• JSPS KAKENHI 19J21785
• JSPS KAKENHI 24KJ1955
• JSPS KAKENHI 22K20359
• JSPS KAKENHI 20H01863
• JSPS KAKENHI 21H04565
• JSPS KAKENHI 24H00322
• JSPS KAKENHI 24H02233
• JST CREST JPMJCR19J4
• The Priority Program of the Chinese Academy of Sciences XDB28000000
• Spintronics Research Network of Japan (Spin RNJ)

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1126/sciadv.adr9481

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更新時刻: 2025-05-16 16:30:19 +0900

MDRでの公開時刻: 2025-05-16 16:19:05 +0900