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

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

doi:10.1103/PhysRevB.95.241305

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

Journal Article · Fri Jun 23 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.241305· OSTI ID:1388976

Li, Junxue ^[1]; Yu, Guoqiang ^[2]; Tang, Chi ^[1]; Liu, Yizhou ^[1]; Shi, Zhong ^[3]; Liu, Yawen ^[1]; Navabi, Aryan ^[2]; Aldosary, Mohammed ^[1]; Shao, Qiming ^[2]; Wang, Kang L. ^[2]; Lake, Roger ^[1]; Shi, Jing ^[1]

Univ. of California, Riverside, CA (United States)
Univ. of California, Los Angeles, CA (United States)
Univ. of California, Riverside, CA (United States); Tongji Univ., Shanghai (China)

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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012670

OSTI ID:: 1388976

Alternate ID(s):: OSTI ID: 1366327

Journal Information:: Physical Review B, Vol. 95, 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; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films Shao, Qiming; Tang, Chi; Yu, Guoqiang Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-06059-7	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 Avci, Can Onur; Rosenberg, Ethan; Baumgartner, Manuel Applied Physics Letters, Vol. 111, Issue 7 https://doi.org/10.1063/1.4994050	journal	August 2017
Pseudomorphic spinel ferrite films with perpendicular anisotropy and low damping Budhani, R. C.; Emori, Satoru; Galazka, Zbigniew Applied Physics Letters, Vol. 113, Issue 8 https://doi.org/10.1063/1.5023118	journal	August 2018
Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films Shao, Qiming; Tang, Chi; Yu, Guoqiang arXiv https://doi.org/10.48550/arxiv.1708.07584	text	January 2017

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