Large spin-orbit torque observed in epitaxial SrIrO3 thin films

Wang, Hailong; Meng, Keng-Yuan; Zhang, Pengxiang; Hou, Justin T.; Finley, Joseph; Han, Jiahao; Yang, Fengyuan; Liu, Luqiao

doi:10.1063/1.5097699

Title: Large spin-orbit torque observed in epitaxial SrIrO₃ thin films

Journal Article · 13 June 2019 · Applied Physics Letters

DOI: https://doi.org/10.1063/1.5097699 · OSTI ID:1594120

Wang, Hailong ^[1]; Meng, Keng-Yuan ^[2]; Zhang, Pengxiang ^[3]; Hou, Justin T. ^[3]; Finley, Joseph ^[3]; Han, Jiahao ^[3]; Yang, Fengyuan ^[2]; Liu, Luqiao ^[3]

Massachusetts Inst. of Technology, Cambridge, MA (United States); Univ. of California, San Diego, La Jolla, CA (United States); The Ohio State University
The Ohio State Univ., Columbus, OH (United States)
Massachusetts Inst. of Technology, Cambridge, MA (United States)

Semimetallic iridate compound SrIrO₃ epitaxial films have been deposited by off-axis sputtering, exhibiting excellent crystalline quality as well as smooth surfaces. By performing second-harmonic Hall measurements on a series of SrIrO₃/Co_1-xTb_x bilayers, we quantitatively determined the spin-to-charge interconversion efficiency θ_SH of SrIrO₃, and discovered a systematic temperature and film thickness dependent evolution behavior. Notably, the measured |θ_SH| reaches a remarkably large number of ~-1.1 at room temperature, which is significantly larger than the value of 5d transition metals and comparable to the values reported in some topological material systems. Finally, our findings are further corroborated by ferromagnetic resonance-driven spin pumping study in SrIrO₃/Py bilayers, highlighting the significant opportunities offered by the iridate compounds in designing next-generation energy-efficient multifunctional spin Hall devices.

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Research Organization:: The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)

Grant/Contract Number:: SC0001304

OSTI ID:: 1594120

Report Number(s):: OSU--01304

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 23 Vol. 114; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Large spin-orbit torque observed in epitaxial SrIrO₃ thin films