Spin orbit torques in Pt-based heterostructures with van der Waals interface

doi:10.1088/1674-1056/ac0908

中国物理B ›› 2021, Vol. 30 ›› Issue (9): 97506-097506.doi: 10.1088/1674-1056/ac0908

所属专题： SPECIAL TOPIC — Two-dimensional magnetic materials and devices

Spin orbit torques in Pt-based heterostructures with van der Waals interface

Qian Chen(陈倩)¹, Weiming Lv(吕伟明)^1,2, Shangkun Li(李尚坤)¹, Wenxing Lv(吕文星)^1,3, Jialin Cai(蔡佳林)^1,2, Yonghui Zhu(朱永慧)¹, Jiachen Wang(王佳晨)¹, Rongxin Li(李荣鑫)¹, Baoshun Zhang(张宝顺)¹, and Zhongming Zeng(曾中明)^1,2,†

1 Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China;
2 Nanchang Nano-Devices and Technologies Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Nanchang 330200, China;
3 Physics Laboratory, Industrial Training Center, Shenzhen Polytechnic, Shenzhen 518055, China

收稿日期:2021-04-26 修回日期:2021-06-03 接受日期:2021-06-08 出版日期:2021-08-19 发布日期:2021-08-24
通讯作者: Zhongming Zeng E-mail:zmzeng2012@sinano.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51732010, 51802341, and 12004415), the China Postdoctoral Science Foundation (Grant Nos. 2020M671592, 2019M661965), and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20200255).

Spin orbit torques in Pt-based heterostructures with van der Waals interface

1 Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China;
2 Nanchang Nano-Devices and Technologies Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Nanchang 330200, China;
3 Physics Laboratory, Industrial Training Center, Shenzhen Polytechnic, Shenzhen 518055, China

Received:2021-04-26 Revised:2021-06-03 Accepted:2021-06-08 Online:2021-08-19 Published:2021-08-24
Contact: Zhongming Zeng E-mail:zmzeng2012@sinano.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51732010, 51802341, and 12004415), the China Postdoctoral Science Foundation (Grant Nos. 2020M671592, 2019M661965), and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20200255).

摘要/Abstract

摘要： Spin orbit torques (SOTs) in ferromagnet/heavy-metal heterostructures have provided great opportunities for efficient manipulation of spintronic devices. However, deterministically field-free switching of perpendicular magnetization with SOTs is forbidden because of the global two-fold rotational symmetry in conventional heavy-metal such as Pt. Here, we engineer the interface of Pt/Ni heterostructures by inserting a monolayer MoTe₂ with low crystal symmetry. It is demonstrated that the spin orbit efficiency, as well as the out-of-plane magnetic anisotropy and the Gilbert damping of Ni are enhanced, due to the effect of orbital hybridization and the increased spin scatting at the interface induced by MoTe₂. Particularly, an out-of-plane damping-like torque is observed when the current is applied perpendicular to the mirror plane of the MoTe₂ crystal, which is attributed to the interfacial inversion symmetry breaking of the system. Our work provides an effective route for engineering the SOT in Pt-based heterostructures, and offers potential opportunities for van der Waals interfaces in spintronic devices.

关键词: spin orbit torque, MoTe₂, van der Waals interface, crystal symmetry

Abstract: Spin orbit torques (SOTs) in ferromagnet/heavy-metal heterostructures have provided great opportunities for efficient manipulation of spintronic devices. However, deterministically field-free switching of perpendicular magnetization with SOTs is forbidden because of the global two-fold rotational symmetry in conventional heavy-metal such as Pt. Here, we engineer the interface of Pt/Ni heterostructures by inserting a monolayer MoTe₂ with low crystal symmetry. It is demonstrated that the spin orbit efficiency, as well as the out-of-plane magnetic anisotropy and the Gilbert damping of Ni are enhanced, due to the effect of orbital hybridization and the increased spin scatting at the interface induced by MoTe₂. Particularly, an out-of-plane damping-like torque is observed when the current is applied perpendicular to the mirror plane of the MoTe₂ crystal, which is attributed to the interfacial inversion symmetry breaking of the system. Our work provides an effective route for engineering the SOT in Pt-based heterostructures, and offers potential opportunities for van der Waals interfaces in spintronic devices.

Key words: spin orbit torque, MoTe₂, van der Waals interface, crystal symmetry

中图分类号: (Spin-orbit effects)

75.70.Tj

75.70.-i (Magnetic properties of thin films, surfaces, and interfaces) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

Qian Chen(陈倩), Weiming Lv(吕伟明), Shangkun Li(李尚坤), Wenxing Lv(吕文星), Jialin Cai(蔡佳林), Yonghui Zhu(朱永慧), Jiachen Wang(王佳晨), Rongxin Li(李荣鑫), Baoshun Zhang(张宝顺), and Zhongming Zeng(曾中明). Spin orbit torques in Pt-based heterostructures with van der Waals interface[J]. 中国物理B, 2021, 30(9): 97506-097506.

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Spin orbit torques in Pt-based heterostructures with van der Waals interface

Spin orbit torques in Pt-based heterostructures with van der Waals interface

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