Deficiency of the bulk spin Hall effect model for spin-orbit torques in magnetic-insulator/heavy-metal heterostructures

被引：23

作者：

Li, Junxue ^{[1
]}

Yu, Guoqiang ^{[2
]}

Tang, Chi ^{[1
]}

Liu, Yizhou ^{[3
]}

Shi, Zhong ^{[1
,4
]}

Liu, Yawen ^{[1
]}

Navabi, Aryan ^{[2
]}

Aldosary, Mohammed ^{[1
]}

Shao, Qiming ^{[2
]}

Wang, Kang L. ^{[2
]}

Lake, Roger ^{[3
]}

Shi, Jing ^{[1
]}

机构：

[1] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[2] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA

[3] Univ Calif Riverside, Dept Elect & Comp Engn, Riverside, CA 92521 USA

[4] Tongji Univ, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 24期

关键词：

FERROMAGNETIC HETEROSTRUCTURES; LAYER; DEPENDENCE; MAGNITUDE; TRANSPORT; DYNAMICS; SYSTEMS; FIELDS;

D O I：

10.1103/PhysRevB.95.241305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electrical currents in a magnetic-insulator/heavy-metal heterostructure can induce two simultaneous effects, namely, spin Hall magnetoresistance (SMR) on the heavy-metal side and spin-orbit torques (SOTs) on the magnetic-insulator side. Within the framework of a pure spin current model based on the bulk spin Hall effect (SHE), the ratio of the spin Hall-induced anomalous Hall effect (SH-AHE) to SMR should be equal to the ratio of the fieldlike torque (FLT) to the dampinglike torque (DLT). We perform a quantitative study of SMR, SH-AHE, and SOTs in a series of thulium iron garnet/platinum or Tm3Fe5O12/Pt heterostructures with different Tm3Fe5O12 thicknesses, where Tm3Fe5O12 is a ferrimagnetic insulator with perpendicular magnetic anisotropy. We find the ratio between the measured effective fields of FLT and DLT is at least two times larger than the ratio of the SH-AHE to SMR. In addition, the bulk SHE model grossly underestimates the spin-torque efficiency of FLT. Our results reveal deficiencies of the bulk SHE model and also address the importance of interfacial effects such as the Rashba and magnetic proximity effects in magnetic-insulator/heavy-metal heterostructures.

引用

页数：5

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