We numerically compute current-induced spin-transfer torques for antiferromagnetic domain walls, based on a linear response theory in a tight-binding model. We find that, unlike for ferromagnetic domain-wall motion, the contribution of adiabatic spin torque to antiferromagnetic domain-wall motion is negligible, consistent with previous theories. As a result, the nonadiabatic spin-transfer torque is a main driving torque for antiferromagnetic domain-wall motion. Moreover, the nonadiabatic spin-transfer torque for narrower antiferromagnetic domain walls increases more rapidly than that for ferromagnetic domain walls, which is attributed to the enhanced spin mistracking process for antiferromagnetic domain walls.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation (NRF) of Korea (Grants No. NRF-2015M3D1A1070465, No. NRF-2017R1A2B2006119) and by the Korea Institute of Science and Technology (KIST) Institutional Program (Projects No. 2V05750, No. 2E30600). G.G. was supported by the NRF of Korea (Grant No. NRF-2019R1I1A1A01063594). H.-W.L. was supported by the NRF of Korea (Grant No. NRF-2018R1A5A6075964).
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics