Comparison between spin-orbit torques measured by domain-wall motions and harmonic measurements

Here we report the comparison of the spin torque efficiencies measured by three different experimental schemes for Pt/Co/X stacks with material X (= Pt, Ta, Ti, Al, Au, Pd, and Ru. 7 materials). The first two spin torque efficiencies ε D W ( 1 ) and ε D W ( 2 ) are quantified by the measurement of s...

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Published in:AIP advances 2018-05, Vol.8 (5), p.056009-056009-5
Main Authors: Kim, Joo-Sung, Nam, Yune-Seok, Kim, Dae-Yun, Park, Yong-Keun, Park, Min-Ho, Choe, Sug-Bong
Format: Article
Language:English
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Summary:Here we report the comparison of the spin torque efficiencies measured by three different experimental schemes for Pt/Co/X stacks with material X (= Pt, Ta, Ti, Al, Au, Pd, and Ru. 7 materials). The first two spin torque efficiencies ε D W ( 1 ) and ε D W ( 2 ) are quantified by the measurement of spin-torque-induced effective field for domain-wall depinning and creeping motions, respectively. The last one—longitudinal spin torque efficiency ε L—is measured by harmonic signal measurement of the magnetization rotation with uniform magnetization configuration. The results confirm that, for all measured Pt/Co/X stacks, ε D W ( 1 ) and ε D W ( 2 ) are exactly consistent to each other and these two efficiencies are roughly proportional to ε L with proportionality constant π/2, which comes from the integration over the domain-wall configuration.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5006868