journal article·2019-12-01Open access

Spin Hall effect investigated by spin Hall magnetoresistance in Pt100−xAux/CoFeB systems

Yoshiaki Saito, Nobuki Tezuka, Shoji Ikeda, Hideo Sato, Tetsuo Endoh

AIP Advances· Volume 9· Issue 12

Abstract

We studied spin Hall effect (SHE) in Pt100-xAux with various Au compositions x for Pt-Au/CoFeB systems by means of spin Hall magnetoresistance (SMR). We synthesized low resistive, flat, and highly (111)-textured Pt-Au alloy films by sputtering using low pressure Kr gas. We found that spin Hall angle (θSH), spin Hall conductivity (σSH), and spin diffusion length (λS) increase by alloying Pt with Au at certain x. The enhancement of σSH is consistent with the theoretically predicted increase in the intrinsic spin Hall conductivity, however quantitatively, there are some discrepancies in θSH and λS between our result and the experimental and theoretical results in the literatures 19 and 20. The discrepancy between our results and previous results would be related to the difference of the nanostructure in Pt-Au alloys related to the scattering from film surfaces and grain boundaries and the degree of phase separation in Pt-Au alloy systems.
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Research context

OpenAlex topics: Magnetic properties of thin films · Magnetic Properties and Applications · Quantum and electron transport phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Innovative Integrated Electronic Systems, Tohoku University 1 , Sendai 980-0845, Japan

Department of Materials Science, Graduate School of Engineering, Tohoku University 2 , Sendai 980-8579, Japan

Center for Spintronics Research Network, Tohoku University 3 , Sendai 980-8577, Japan

Center for Science and Innovation in Spintronics (Core Research Cluster), Tohoku University 4 , Sendai 980-8577, Japan

Research Institute of Electrical Communication, Tohoku University 5 , Sendai 980-8577, Japan

Department of Electrical Engineering, Graduate School of Engineering, Tohoku University 6 , Sendai 980-8579, Japan

Funding

Program on Open Innovation Platform with Enterprises, Research Institute and Academia · Japan Society for the Promotion of Science

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