Evaluation of Spin Hall Effect in Ferromagnets by Means of Unidirectional Spin Hall Magnetoresistance in Ta/Co Bilayers

We investigate unidirectional spin Hall magnetoresistance (USMR) in Ta/Co bilayer systems with various Co thicknesses. A negative USMR is observed when the thickness of Co is thin due to the negative spin Hall angle of Ta, as expected from the conventional framework. However, as the Co thickness inc...

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Bibliographic Details
Published inJournal of the Magnetics Society of Japan Vol. 48; no. 2
Main Authors Aoki, M, Ohshima, R, Shinjo, T, Shiraishi, M, Ando, Y
Format Journal Article
LanguageEnglish
Published Tokyo Japan Science and Technology Agency 01.03.2024
Subjects
Ferromagnetism
Hall effect
Magnetoresistance
Magnetoresistivity
Thickness
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ISSN1882-2924
1882-2932
DOI10.3379/msjmag.2403R003

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Summary:We investigate unidirectional spin Hall magnetoresistance (USMR) in Ta/Co bilayer systems with various Co thicknesses. A negative USMR is observed when the thickness of Co is thin due to the negative spin Hall angle of Ta, as expected from the conventional framework. However, as the Co thickness increases, the amplitude of USMR becomes strongly suppressed, and the sign of USMR becomes positive, which cannot be explained by theoretical calculation considering only the spin Hall effect (SHE) in the Ta layer. We successfully explain the anomalous thickness dependence of USMR by considering USMR induced by SHE in the Co layer. This work verifies the significant influence of SHE in ferromagnets on the measurement of USMR and will contribute to a better understanding of USMR.
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ISSN:1882-2924
1882-2932
DOI:10.3379/msjmag.2403R003