Bidirectional spin-wave-driven domain wall motion in ferrimagnets

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We investigate ferrimagnetic domain-wall dynamics induced by circularly polarized spin waves theoretically and numerically. We find that the direction of domain-wall motion depends on both the circular polarization of spin waves and the sign of net spin density of the ferrimagnet. Below the angular momentum compensation point, left-circularly (right-circularly) polarized spin waves push a domain wall towards (away from) the spin-wave source. Above the angular momentum compensation point, on the other hand, the direction of domain-wall motion is reversed. This bidirectional motion originates from the fact that the sign of spin-wave-induced magnonic torque depends on the circular polarization and the subsequent response of the domain wall to the magnonic torque is governed by the net spin density. Our finding provides a way to utilize a spin wave as a versatile driving force for bidirectional domain-wall motion.
Publisher
AMER PHYSICAL SOC
Issue Date
2019-11
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.100, no.17, pp.174403

ISSN
2469-9950
DOI
10.1103/PhysRevB.100.174403
URI
http://hdl.handle.net/10203/274541
Appears in Collection
PH-Journal Papers(저널논문)
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