Temperature dependence of spin Hall magnetoresistance in W/CoFeB bilayer

We investigate the temperature dependence of the spin Hall magnetoresistance (SMR) in a W/CoFeB bilayer. The SMR is found to increase with decreasing temperature. An analysis based on the SMR theory suggests that the spin Hall angle of W and/or the spin polarization of CoFeB can be the origin of the...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2016-08, Vol.55 (8), p.80308
Main Authors: Okuno, Takaya, Taniguchi, Takuya, Kim, Sanghoon, Baek, Seung-heon Chris, Park, Byong-Guk, Moriyama, Takahiro, Kim, Kab-Jin, Ono, Teruo
Format: Article
Language:English
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Summary:We investigate the temperature dependence of the spin Hall magnetoresistance (SMR) in a W/CoFeB bilayer. The SMR is found to increase with decreasing temperature. An analysis based on the SMR theory suggests that the spin Hall angle of W and/or the spin polarization of CoFeB can be the origin of the temperature dependence of the SMR. We also find that the spin diffusion length and the resistivity of W do not significantly vary with temperature, which indicates the necessity of further study on the electron transport mechanism in W films to reveal the origin of the spin Hall effect in W.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.55.080308