Antiferromagnetic Skyrmion: Stability, Creation and Manipulation
#MMPMID27099125
Zhang X
; Zhou Y
; Ezawa M
Sci Rep
2016[Apr]; 6
(?): 24795
PMID27099125
show ga
Magnetic skyrmions are particle-like topological excitations in ferromagnets,
which have the topo-logical number Q?=?±?1, and hence show the skyrmion Hall
effect (SkHE) due to the Magnus force effect originating from the topology. Here,
we propose the counterpart of the magnetic skyrmion in the antiferromagnetic
(AFM) system, that is, the AFM skyrmion, which is topologically protected but
without showing the SkHE. Two approaches for creating the AFM skyrmion have been
described based on micromagnetic lattice simulations: (i) by injecting a vertical
spin-polarized current to a nanodisk with the AFM ground state; (ii) by
converting an AFM domain-wall pair in a nanowire junction. It is demonstrated
that the AFM skyrmion, driven by the spin-polarized current, can move straightly
over long distance, benefiting from the absence of the SkHE. Our results will
open a new strategy on designing the novel spintronic devices based on AFM
materials.
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