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2017 ; 8
(1
): 1717
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Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity
locking-unlocking transition
#MMPMID29167418
Zhang X
; Xia J
; Zhou Y
; Liu X
; Zhang H
; Ezawa M
Nat Commun
2017[Nov]; 8
(1
): 1717
PMID29167418
show ga
The helicity-orbital coupling is an intriguing feature of magnetic skyrmions in
frustrated magnets. Here we explore the skyrmion dynamics in a frustrated magnet
based on the J (1)-J (2)-J (3) classical Heisenberg model explicitly by including
the dipole-dipole interaction. The skyrmion energy acquires a helicity dependence
due to the dipole-dipole interaction, resulting in the current-induced
translational motion with a fixed helicity. The lowest-energy states are the
degenerate Bloch-type states, which can be used for building the binary memory.
By increasing the driving current, the helicity locking-unlocking transition
occurs, where the translational motion changes to the rotational motion.
Furthermore, we demonstrate that two skyrmions can spontaneously form a bound
state. The separation of the bound state forced by a driving current is also
studied. In addition, we show the annihilation of a pair of skyrmion and
antiskyrmion. Our results reveal the distinctive frustrated skyrmions may enable
viable applications in topological magnetism.