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Micromagnetic study of excitation modes of an artificial skyrmion crystal

Authors :
L. Sun
Ming Yan
Bingfeng Miao
R. X. Cao
Z.S. Jiang
Y. Wen
Biao You
Haifeng Ding
Di Wu
Source :
Applied Physics Letters. 107:222402
Publication Year :
2015
Publisher :
AIP Publishing, 2015.

Abstract

We present a micromagnetic study on the eigen excitations of an artificial skyrmion crystal, which has been experimentally confirmed to be stable at room temperature without the need of any Dzyaloshinsky-Moriya interaction (DMI). Three in-plane rotational modes and one breathing-type mode are identified. We find the intrinsic origin of the dynamics of skyrmion crystal is the nontrivial magnetic texture instead of DMI. And the rotational direction of a skyrmion is solely determined by the sign of the skyrmion number, irrespective of its circulation sense, evidencing the topological nature of the magnetic skyrmion.

Details

ISSN :
10773118 and 00036951
Volume :
107
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........49b6c112edb7e7993e9beb8f0492c446
Full Text :
https://doi.org/10.1063/1.4936756