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

Journal Article · · Physical Review B
 [1];  [2];  [3];  [3];  [3];  [3]; ;  [3]
  1. The Ohio State Univ., Columbus, OH (United States); The Ohio State University
  2. Univ. of California, Los Angeles, CA (United States)
  3. The Ohio State Univ., Columbus, OH (United States)
Out-of-plane angular (θH) dependence of inverse spin Hall effect (ISHE) voltage (VISHE) generated by spin pumping has been investigated in Y3Fe5O12 (YIG)/NiO/Pt trilayers. A simple sinusoidal angular dependence of VISHE has been viewed as a signature of spin pumping. Surprisingly, we observe an extensive plateau in the VISHE vs. θH plots with a pronounced peak feature at θH ~ 45 to 60 degrees when the measurement temperature is close to the Néel temperature (TN) 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.
Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-03ER46054; SC0001304
OSTI ID:
1594089
Alternate ID(s):
OSTI ID: 1494219
Report Number(s):
DOE-OSU--20451
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 99; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Pure spin current in antiferromagnetic insulators journal September 2019

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