Influence of thickness on current-induced magnetization switching in L10-FePt single layer

doi:10.1088/1674-1056/ac0a62

中国物理B ›› 2021, Vol. 30 ›› Issue (10): 107101-107101.doi: 10.1088/1674-1056/ac0a62

Influence of thickness on current-induced magnetization switching in L1₀-FePt single layer

Shi-Qi Zheng(郑诗琪)¹, Kang-Kang Meng(孟康康)^1,†, Zhen-Guo Fu(付振国)², Ji-Kun Chen(陈吉堃)¹, Jun Miao(苗君)¹, Xiao-Guang Xu(徐晓光)¹, and Yong Jiang(姜勇)^1,‡

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2 Institute of Applied Physics and Computational Mathematics, Beijing 100083, China

收稿日期:2021-03-06 修回日期:2021-06-07 接受日期:2021-06-11 发布日期:2021-09-26
通讯作者: Kang-Kang Meng, Yong Jiang E-mail:kkmeng@ustb.edu.cn;yjiang@ustb.edu.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2019YFB2005801), the National Natural Science Foundation of China (Grant Nos. 51971027, 51731003, 51971023, 51927802, and 51971024), and the Fundamental Research Funds for the Central Universities, China (Grant No. FRF-TP-19-001A3).

Influence of thickness on current-induced magnetization switching in L1₀-FePt single layer

Shi-Qi Zheng(郑诗琪)¹, Kang-Kang Meng(孟康康)^1,†, Zhen-Guo Fu(付振国)², Ji-Kun Chen(陈吉堃)¹, Jun Miao(苗君)¹, Xiao-Guang Xu(徐晓光)¹, and Yong Jiang(姜勇)^1,‡

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2 Institute of Applied Physics and Computational Mathematics, Beijing 100083, China

Received:2021-03-06 Revised:2021-06-07 Accepted:2021-06-11 Published:2021-09-26
Contact: Kang-Kang Meng, Yong Jiang E-mail:kkmeng@ustb.edu.cn;yjiang@ustb.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2019YFB2005801), the National Natural Science Foundation of China (Grant Nos. 51971027, 51731003, 51971023, 51927802, and 51971024), and the Fundamental Research Funds for the Central Universities, China (Grant No. FRF-TP-19-001A3).

摘要/Abstract

摘要： The thickness dependent spin-orbit torque (SOT) in an L1₀-FePt single layer is investigated in this work. As the thickness increases from 8 nm to 16 nm, the magnetization switching ratio in the L1₀-FePt film with higher chemical ordering becomes smaller. It is noted that compared with 3-nm-thick L1₀-FePt film, 8-nm-thick L1₀-FePt film can switch much magnetization with the increase of chemical ordering. When the FePt film is thick enough, the SOT in FePt is closely related to the L1₀-ordered structure, which indicates a bulk nature. Therefore, the disordering plays an important role in the magnetization switching only for the ultra-thin FePt films, while the structural gradient may play an important role for thicker films. However, both of the two mechanisms cannot fully explain the process of magnetization switching and the spin current generation. Although many factors influence SOT, here in this work we emphasize only the bulk nature of strong SOC in L1₀-FePt through density functional theory calculations, which should generate large spin current due to spin Hall effect.

关键词: spin-orbit coupling, magnetic anisotropy, spin transport effects

Abstract: The thickness dependent spin-orbit torque (SOT) in an L1₀-FePt single layer is investigated in this work. As the thickness increases from 8 nm to 16 nm, the magnetization switching ratio in the L1₀-FePt film with higher chemical ordering becomes smaller. It is noted that compared with 3-nm-thick L1₀-FePt film, 8-nm-thick L1₀-FePt film can switch much magnetization with the increase of chemical ordering. When the FePt film is thick enough, the SOT in FePt is closely related to the L1₀-ordered structure, which indicates a bulk nature. Therefore, the disordering plays an important role in the magnetization switching only for the ultra-thin FePt films, while the structural gradient may play an important role for thicker films. However, both of the two mechanisms cannot fully explain the process of magnetization switching and the spin current generation. Although many factors influence SOT, here in this work we emphasize only the bulk nature of strong SOC in L1₀-FePt through density functional theory calculations, which should generate large spin current due to spin Hall effect.

Key words: spin-orbit coupling, magnetic anisotropy, spin transport effects

中图分类号: (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

71.70.Ej

71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect) 75.76.+j (Spin transport effects)

Shi-Qi Zheng(郑诗琪), Kang-Kang Meng(孟康康), Zhen-Guo Fu(付振国), Ji-Kun Chen(陈吉堃), Jun Miao(苗君), Xiao-Guang Xu(徐晓光), and Yong Jiang(姜勇). Influence of thickness on current-induced magnetization switching in L1₀-FePt single layer[J]. 中国物理B, 2021, 30(10): 107101-107101.

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Influence of thickness on current-induced magnetization switching in L1₀-FePt single layer

Influence of thickness on current-induced magnetization switching in L1₀-FePt single layer

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