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

Abstract

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.

Authors:
 [1];  [2];  [1];  [1];  [3];  [1];  [2];  [1];  [2];  [2];  [1];  [1]
  1. Univ. of California, Riverside, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Univ. of California, Riverside, CA (United States); Tongji Univ., Shanghai (China)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1388976
Alternate Identifier(s):
OSTI ID: 1366327
Grant/Contract Number:  
SC0012670
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 24; Related Information: SHINES partners with University of California, Riverside (lead); Arizona State University; Colorado State University; Johns Hopkins University; University of California Irvine; University of California Los Angeles; University of Texas at Austin; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Li, Junxue, Yu, Guoqiang, Tang, Chi, Liu, Yizhou, Shi, Zhong, Liu, Yawen, Navabi, Aryan, Aldosary, Mohammed, Shao, Qiming, Wang, Kang L., Lake, Roger, and Shi, Jing. Deficiency of the bulk spin Hall effect model for spin-orbit torques in magnetic-insulator/heavy-metal heterostructures. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.241305.
Li, Junxue, Yu, Guoqiang, Tang, Chi, Liu, Yizhou, Shi, Zhong, Liu, Yawen, Navabi, Aryan, Aldosary, Mohammed, Shao, Qiming, Wang, Kang L., Lake, Roger, & Shi, Jing. Deficiency of the bulk spin Hall effect model for spin-orbit torques in magnetic-insulator/heavy-metal heterostructures. United States. https://doi.org/10.1103/PhysRevB.95.241305
Li, Junxue, Yu, Guoqiang, Tang, Chi, Liu, Yizhou, Shi, Zhong, Liu, Yawen, Navabi, Aryan, Aldosary, Mohammed, Shao, Qiming, Wang, Kang L., Lake, Roger, and Shi, Jing. 2017. "Deficiency of the bulk spin Hall effect model for spin-orbit torques in magnetic-insulator/heavy-metal heterostructures". United States. https://doi.org/10.1103/PhysRevB.95.241305. https://www.osti.gov/servlets/purl/1388976.
@article{osti_1388976,
title = {Deficiency of the bulk spin Hall effect model for spin-orbit torques in magnetic-insulator/heavy-metal heterostructures},
author = {Li, Junxue and Yu, Guoqiang and Tang, Chi and Liu, Yizhou and Shi, Zhong and Liu, Yawen and Navabi, Aryan and Aldosary, Mohammed and Shao, Qiming and Wang, Kang L. and Lake, Roger and Shi, Jing},
abstractNote = {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.},
doi = {10.1103/PhysRevB.95.241305},
url = {https://www.osti.gov/biblio/1388976}, journal = {Physical Review B},
issn = {2469-9950},
number = 24,
volume = 95,
place = {United States},
year = {Fri Jun 23 00:00:00 EDT 2017},
month = {Fri Jun 23 00:00:00 EDT 2017}
}

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Cited by: 20 works
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Works referenced in this record:

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Works referencing / citing this record:

Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films
journal, September 2018


Fast switching and signature of efficient domain wall motion driven by spin-orbit torques in a perpendicular anisotropy magnetic insulator/Pt bilayer
journal, August 2017


Pseudomorphic spinel ferrite films with perpendicular anisotropy and low damping
journal, August 2018