Spin-orbit torques associated with ferrimagnetic order in Pt/GdFeCo/MgO layers

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We investigate spin orbit torque (SOT) efficiencies and magnetic properties of Pt/GdFeCo/MgO multilayers by varying the thicknesses of GdFeCo and MgO layers. Our studies indicate that the ferrimagnetism in the GdFeCo alloy is considerably influenced by both thicknesses due to the diffusion of Gd atoms toward the MgO layer. Comparing to conventional Pt/ferromagnet/MgO structures, the Pt/GdFeCo/MgO exhibits a lower efficiency of SOTs associated with ferrimagnetic order and a similar magnitude of magnetic damping. The previous models that have been developed for rigid ferromagnets are inappropriate to analyze our experimental data, leading to an unphysical consequence of spin transmission larger than unity. Our results imply that the heavy-metal/ferrimagnet system is quite different from heavy-metal/ferromagnet systems in terms of magnetic dynamical modes, spin angular momentum transfer, and relaxation processes.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2018-04
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.8

ISSN
2045-2322
DOI
10.1038/s41598-018-24480-2
URI
http://hdl.handle.net/10203/277422
Appears in Collection
PH-Journal Papers(저널논문)
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