Spin-orbit Torque Switching of Perpendicular Magnetization in Ferromagnetic Trilayers

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In ferromagnetic trilayers, a spin-orbit-induced spin current can have a spin polarization of which direction is deviated from that for the spin Hall effect. Recently, magnetization switching in ferromagnetic trilayers has been proposed and confirmed by the experiments. In this work, we theoretically and numerically investigate the switching current required for perpendicular magnetization switching in ferromagnetic trilayers. We confirm that the tilted spin polarization enables field-free deterministic switching at a lower current than conventional spin-orbit torque or spin-transfer torque switching, offering a possibility for high-density and low-power spin-orbit torque devices. Moreover, we provide analytical expressions of the switching current for an arbitrary spin polarization direction, which will be useful to design spin-orbit torque devices and to interpret spin-orbit torque switching experiments.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2020-02
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.10, no.1

ISSN
2045-2322
DOI
10.1038/s41598-020-58669-1
URI
http://hdl.handle.net/10203/277397
Appears in Collection
PH-Journal Papers(저널논문)
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