Giant charge-to-spin conversion in ferromagnet via spin-orbit coupling

Yuki Hibino (), Tomohiro Taniguchi, Kay Yakushiji, Akio Fukushima, Hitoshi Kubota and Shinji Yuasa
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Yuki Hibino: Research Center for Emerging Computing Technologies
Tomohiro Taniguchi: Research Center for Emerging Computing Technologies
Kay Yakushiji: Research Center for Emerging Computing Technologies
Akio Fukushima: Research Center for Emerging Computing Technologies
Hitoshi Kubota: Research Center for Emerging Computing Technologies
Shinji Yuasa: Research Center for Emerging Computing Technologies

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Converting charge current into spin current via the spin Hall effect enables efficient manipulation of magnetization by electrical current. However, its geometrical restriction is a serious obstacle to device applications because it prevents switching of perpendicular magnetization in the absence of an external field. To resolve this issue, ferromagnetic materials have attracted attentions because their time reversal asymmetry induces magnetic-dependent charge-to-spin conversion that removes this restriction. Here, we achieved a large enhancement of magnetic-dependent charge-to-spin conversion by clarifying its mechanism. Through layer thickness dependence of the conversion efficiency, we revealed a coexistence of interfacial and bulk contributions to the magnetic-dependent charge-to-spin conversion. Moreover, the interfacial contribution to charge-to-spin conversion is found to be dominant and can be controlled via interfacial band engineering. The efficiency of charge-to-spin conversion in ferromagnet was found to be an order larger than that of other materials with reduced symmetry.

Date: 2021
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DOI: 10.1038/s41467-021-26445-y

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