journal article·2021-02-01Open access

W thickness dependence of spin Hall effect for (W/Hf)-multilayer electrode/CoFeB/MgO systems with flat and highly (100) oriented MgO layer

Yoshiaki Saito, Nobuki Tezuka, Shoji Ikeda, Tetsuo Endoh

AIP Advances· Volume 11· Issue 2

Abstract

We investigated spin-Hall effect (SHE) and degree of MgO (100) orientation in artificially synthesized (W/Hf)-multilayer/CoFeB/MgO systems with various W thicknesses. We found that the artificially synthesized multilayer systems can enhance the spin-Hall effect and control the value of spin diffusion length. We observed a maximum magnitude in both spin-Hall angle and spin-Hall conductivity as a function of W thickness in W/Hf-multilayer systems, and found that the values of spin-Hall conductivity are larger than that for β-phase W. In addition, a more highly oriented MgO (100) texture on CoFeB is obtained for (W/Hf)-multilayer systems prepared under low-Ar-pressure condition, which would be suitable for preparation of magnetic tunnel junctions with high tunnel magnetoresistance properties on (W/Hf)-multilayer heavy metal electrode. These results suggest that the artificially synthesized multilayer system is one of the avenues for realizing spin devices using spin-orbit torque.
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Research context

OpenAlex topics: Magnetic properties of thin films · ZnO doping and properties · Copper Interconnects and Reliability

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, 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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