Magnetization reorientation induced by spin–orbit torque in YIG/Pt bilayers
Ying-Yi Tian(田颖异)1, Shuan-Hu Wang(王拴虎)1, †, Gang Li(李刚)3, Hao Li(李豪)1, Shu-Qin Li(李书琴)1, Yang Zhao(赵阳)1, Xiao-Min Cui(崔晓敏)1, Jian-Yuan Wang(王建元)1, Lv-Kuan Zou(邹吕宽)2, and Ke-Xin Jin(金克新)1,, ‡
1 Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, School of Science, Northwestern Polytechnical University, Xi’an 710072, China 2 High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China 3 School of Science and Technology, Tianjin University of Finance and Economics, Tianjin 300222, China
In this work, we report the reorientation of magnetization by spin–orbit torque (SOT) in YIG/Pt bilayers. The SOT is investigated by measuring the spin Hall magnetoresistance (SMR), which is highly sensitive to the direction of magnetic moment of YIG. An external in-plane rotating magnetic field which is applied to the YIG/Pt bilayers, and the evolutions of SMR under different injected currents in the Pt layer, result in deviation of SMR curve from the standard shape. We conclude that the SOT caused by spin accumulation near the interface between YIG and Pt can effectively reorient the in-plane magnetic moment of YIG. This discovery provides an effective way to modulate YIG magnetic moments by electrical methods.
Received: 12 August 2020
Revised: 31 August 2020
Accepted manuscript online: 09 September 2020
Fund: the Natural Science Foundation of Shaanxi Province, China (Grant No. 2020JM-088), the National Natural Science Foundation of China (Grant Nos. 51572222, 51701158, and 51872241), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 3102017jc01001 and 310201911cx044).
Ying-Yi Tian(田颖异), Shuan-Hu Wang(王拴虎), Gang Li(李刚), Hao Li(李豪), Shu-Qin Li(李书琴), Yang Zhao(赵阳), Xiao-Min Cui(崔晓敏), Jian-Yuan Wang(王建元), Lv-Kuan Zou(邹吕宽), and Ke-Xin Jin(金克新) Magnetization reorientation induced by spin–orbit torque in YIG/Pt bilayers 2020 Chin. Phys. B 29 117504
Fig. 1.
[(a) and (b)] Normalized VISHE–H curves of YIG(5 nm)/Pt and YIG(3 nm)/Pt bilayers, respectively. (c) Schematic diagram of experimental setup with inset indicating optical image of YIG(3 nm)/Pt sample. The unit 1 Oe = 79.5775 A⋅m−1.
Fig. 2.
(a) YIG(5 nm)/Pt SMR curves with different values of Je under external magnetic field of H = 1500 Oe. (b) YIG(5 nm)/Pt SMR curves with Je = 1 ° 106 A/cm2versus in-plane rotation angle under magnetic field of 10, 6, and 4 Oe.
Fig. 3.
Curves of normalized SMR–βversusβ for the YIG(5 nm)/Pt sample with driving current Je = 1 × 105 (a), 2 × 105 (b), 1 × 106 (c), and 2 × 106 A/cm2 (d) under external magnetic field 4 Oe.
Fig. 4.
Relationships between theoretical value β and actual value β′ in YIG(5 nm)/Pt sample under different values of (a) driving current Je and (b) H, with insert showing that antidamping torque is applied to M, causing M to deviate from the direction of external magnetic field H.
Fig. 5.
Curves of normalized SMR versusβ for driving current Je = 1 × 103 A/cm2 (grey dots) and 1 × 105 A/cm2 (red dots) along easy axis of YIG(3 nm)/Pt sample under external magnetic field H = 4 Oe.
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