Junction size dependence of the heat controlled magnetic anisotropy in magnetic tunnel junctions

Minori Goto, Reika Kobayashi, Ryota Okuno,Tomohito Mizuno,Takekazu Yamane,Naomichi Degawa,Tsuyoshi Suzuki,Atsushi Shimura,Susumu Aoki,Junichiro Urabe,Shinji Hara,Hikaru Nomura,Yoshishige Suzuki

APPLIED PHYSICS EXPRESS（2022）

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摘要

We investigated the heat controlled magnetic anisotropy (HCMA) in magnetic tunnel junctions with various junction sizes. We evaluated the HCMA from perpendicular magnetic anisotropy under a direct current voltage measured by the spin-torque diode technique. The maximum HCMA magnitude of 5.4 mu J (Wm)(-1) was observed, and the HCMA increased with increasing diameter. Our results can be explained by a simple heat dissipation model and suggest that the in-plane heat current affects HCMA.

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关键词

heat controlled magnetic anisotropy, magnetic tunnel junction, thermal resistance

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