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2018 ; 9
(1
): 2115
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Manipulation of skyrmion motion by magnetic field gradients
#MMPMID29844391
Zhang SL
; Wang WW
; Burn DM
; Peng H
; Berger H
; Bauer A
; Pfleiderer C
; van der Laan G
; Hesjedal T
Nat Commun
2018[May]; 9
(1
): 2115
PMID29844391
show ga
Magnetic skyrmions are particle-like, topologically protected magnetisation
entities that are promising candidates as information carriers in racetrack
memory. The transport of skyrmions in a shift-register-like fashion is crucial
for their embodiment in practical devices. Here, we demonstrate that chiral
skyrmions in Cu(2)OSeO(3) can be effectively manipulated under the influence of a
magnetic field gradient. In a radial field gradient, skyrmions were found to
rotate collectively, following a given velocity-radius relationship. As a result
of this relationship, and in competition with the elastic properties of the
skyrmion lattice, the rotating ensemble disintegrates into a shell-like structure
of discrete circular racetracks. Upon reversing the field direction, the rotation
sense reverses. Field gradients therefore offer an effective handle for the fine
control of skyrmion motion, which is inherently driven by magnon currents. In
this scheme, no local electric currents are needed, thus presenting a different
approach to shift-register-type operations based on spin transfer torque.