Nonsinusoidal angular dependence of FMR-driven spin current across an antiferromagnet in Y3Fe5O12/NiO/Pt trilayers

Cheng, Yang; Zarzuela, Ricardo; Brangham, Jack T.; Lee, Aidan J.; White, Shane; Hammel, P. Chris; Tserkovnyak, Yaroslav; Yang, Fengyuan

doi:10.1103/PhysRevB.99.060405

Title: Nonsinusoidal angular dependence of FMR-driven spin current across an antiferromagnet in $Y_{3} F e_{5} O_{12} / NiO / Pt$ trilayers

Journal Article · Mon Feb 11 00:00:00 EST 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.060405· OSTI ID:1594089

Cheng, Yang ^[1]; Zarzuela, Ricardo ^[2]; Brangham, Jack T. ^[1]; Lee, Aidan J. ^[1]; White, Shane ^[1]; Hammel, P. Chris ^[1]; Tserkovnyak, Yaroslav; Yang, Fengyuan ^[1]

The Ohio State Univ., Columbus, OH (United States)
Univ. of California, Los Angeles, CA (United States)

Out-of-plane angular (θH) dependence of inverse spin Hall effect (ISHE) voltage (V_ISHE) generated by spin pumping has been investigated in Y₃Fe₅O₁₂ (YIG)/NiO/Pt trilayers. A simple sinusoidal angular dependence of V_ISHE has been viewed as a signature of spin pumping. Surprisingly, we observe an extensive plateau in the V_ISHE vs. θH plots with a pronounced peak feature at θH ~ 45 to 60 degrees when the measurement temperature is close to the Néel temperature (T_N) of NiO. This phenomenon can be understood as arising from the competition between the exchange coupling at the YIG/NiO interface, the easy-plane and in-plane easy-axis anisotropies of NiO, and the effect of the applied magnetic field. We conclude, while insulating antiferromagnetic films can efficiently transmit spin currents and show promise for integration in spintronic devices, the underlying physics of spin ordering and dynamics is richer than currently understood.

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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); National Science Foundation (NSF)

Grant/Contract Number:: SC0001304; DMR-1420451; FG02-03ER46054; DMR-1742928

OSTI ID:: 1594089

Alternate ID(s):: OSTI ID: 1494219

Report Number(s):: DOE-OSU-20451; PRBMDO; TRN: US2101469

Journal Information:: Physical Review B, Vol. 99, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Nonsinusoidal angular dependence of FMR-driven spin current across an antiferromagnet in $Y_{3} F e_{5} O_{12} / NiO / Pt$ trilayers