Variation of spin-orbit torque and spin transport properties by V alloying in beta-W-based magnetic heterostructures
- Authors
- Kim, Gyu Won; Lee, Jeong Kyu; Kim, Taehyun; Lee, Min Hyeok; Cha, In Ho; Cho, Jiung; Lee, OukJae; Kim, Young Keun
- Issue Date
- 1-4월-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Spin-orbit torque; W-V alloy; Normal metal; ferromagnet heterostructure; Magnetic Anisotropy; Current-induced magnetization switching
- Citation
- SCRIPTA MATERIALIA, v.211
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCRIPTA MATERIALIA
- Volume
- 211
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/143103
- DOI
- 10.1016/j.scriptamat.2021.114486
- ISSN
- 1359-6462
- Abstract
- Of transition metals, beta-W exhibits the maximum charge-to-spin conversion efficiency. However, due to the lack of phase stability, the beta-W-based alloy has rarely been investigated as a spin current generating layer. This study examines W-V alloy layers with various W100-xVx/CoFeB/MgO/Ta heterostructure compositions. X-ray diffraction confirms that the beta-W matrix is conserved up to a V content of 20 at%. We attain a maximum damping-like torque efficiency of - 0.45 +/- 0.04 for the W80V20 alloy-based heterostructure through the harmonic response method. Furthermore, we determine the spin diffusion length of the W80V20 layer and specify the interfacial spin transparency of the W80V20/CoFeB structure by adopting the spin diffusion model. Consequently, we suggest an intrinsic spin-Hall angle of -0.86. In addition, we observe in-plane current-induced switching. Our results establish the potential of the beta-phase W-V alloy layer as a spin current source layer in spintronic devices. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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