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

doi:10.1016/j.scriptamat.2021.114486

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (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 W_100-xV_x/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 language	English
Article number	114486
Journal	Scripta Materialia
Volume	211
DOIs	https://doi.org/10.1016/j.scriptamat.2021.114486
Publication status	Published - 2022 Apr 1

Keywords

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

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2021.114486

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@article{62093375a038416fa7e504b6580606e6,

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

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.",

keywords = "Current-induced magnetization switching, Magnetic Anisotropy, Normal metal/ferromagnet heterostructure, Spin-orbit torque, W-V alloy",

author = "Kim, {Gyu Won} and Lee, {Jeong Kyu} and Taehyun Kim and Lee, {Min Hyeok} and Cha, {In Ho} and Jiung Cho and Lee, {Ouk Jae} and Kim, {Young Keun}",

note = "Funding Information: This research was supported by the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT (2015M3D1A1070465, 2020M3F3A2A01082591), and in part by Samsung Electronics Co. Ltd. (IO201211-08104-01). Funding Information: This research was supported by the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT ( 2015M3D1A1070465 , 2020M3F3A2A01082591 ), and in part by Samsung Electronics Co., Ltd. ( IO201211-08104-01 ). Publisher Copyright: {\textcopyright} 2021",

year = "2022",

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doi = "10.1016/j.scriptamat.2021.114486",

language = "English",

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T1 - Variation of spin-orbit torque and spin transport properties by V alloying in β-W-based magnetic heterostructures

AU - Kim, Gyu Won

AU - Lee, Jeong Kyu

AU - Kim, Taehyun

AU - Lee, Min Hyeok

AU - Cha, In Ho

AU - Cho, Jiung

AU - Lee, Ouk Jae

AU - Kim, Young Keun

N1 - Funding Information: This research was supported by the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT (2015M3D1A1070465, 2020M3F3A2A01082591), and in part by Samsung Electronics Co. Ltd. (IO201211-08104-01). Funding Information: This research was supported by the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT ( 2015M3D1A1070465 , 2020M3F3A2A01082591 ), and in part by Samsung Electronics Co., Ltd. ( IO201211-08104-01 ). Publisher Copyright: © 2021

PY - 2022/4/1

Y1 - 2022/4/1

N2 - 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.

AB - 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.

KW - Current-induced magnetization switching

KW - Magnetic Anisotropy

KW - Normal metal/ferromagnet heterostructure

KW - Spin-orbit torque

KW - W-V alloy

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U2 - 10.1016/j.scriptamat.2021.114486

DO - 10.1016/j.scriptamat.2021.114486

M3 - Article

AN - SCOPUS:85122315820

SN - 1359-6462

VL - 211

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 114486

ER -

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

Abstract

Keywords

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