Variation of spin-orbit torque and spin transport properties by V alloying in β-W-based magnetic heterostructures

Gyu Won Kim, Jeong Kyu Lee, Taehyun Kim, Min Hyeok Lee, In Ho Cha, Jiung Cho, Ouk Jae Lee, Young Keun Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Of transition metals, β-W exhibits the maximum charge-to-spin conversion efficiency. However, due to the lack of phase stability, the β-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 β-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 β-phase W-V alloy layer as a spin current source layer in spintronic devices.

Original languageEnglish
Article number114486
JournalScripta Materialia
Volume211
DOIs
Publication statusPublished - 2022 Apr 1

Bibliographical note

Publisher Copyright:
© 2021

Keywords

  • Current-induced magnetization switching
  • Magnetic Anisotropy
  • Normal metal/ferromagnet heterostructure
  • Spin-orbit torque
  • W-V alloy

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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