We theoretically and numerically investigate ferrimagnetic domain wall motion driven by damping-like spin-orbit torque. We find that the damping-like spin-orbit torque combined with the interfacial Dzyaloshinskii-Moriya interaction efficiently drives the ferrimagnetic domain wall especially at the angular momentum compensation point. We obtain the analytic expression of the domain wall velocity with respect to the current density and the net spin density, which is in agreement with numerical simulation. The analytic expression is applicable to arbitrary compensation conditions, ranging from the ferromagnetic limit to the antiferromag-netic limit, and is thus useful to design and interpret ferrimagnetic domain wall experiments at various temperatures or compositions.
Bibliographical noteFunding Information:
We acknowledge S.-K. Kim for fruitful discussions. This work is supported by the National Research Foundation of Korea (NRF) (Grants No. 2015M3D1A1070465 and No. 2017R1A2B2006119) and the KIST Institutional Program (Project No. 2V05750).
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- Angular momentum compensation
- Dzyaloshinskii-moriya interaction
- Ferrimagnetic domain wall
- Spin-orbit torque
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering