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

Title
Spin-orbit torques associated with ferrimagnetic order in Pt/GdFeCo/MgO layers
Authors
구현철민병철이억재이동준김종혁이경진주병권
Keywords
spin orbit torque; magnetic damping; ferrimagnet; spin torque ferromagnetic resonance
Issue Date
2018-04
Publisher
Scientific Reports
Citation
VOL 8, NO 6017-8
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/68041
ISSN
2045-2322
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KIST Publication > Article
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