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Dynamically stabilized magnetic skyrmions

Journal article
Authors Y. Zhou
Ezio Iacocca
Ahmad Awad
Randy K. Dumas
F. C. Zhang
H. B. Braun
Johan Åkerman
Published in Nature Communications
Volume 6
Pages Article nr. 8193
ISSN 2041-1723
Publication year 2015
Published at Department of Physics (GU)
Pages Article nr. 8193
Language en
Links dx.doi.org/10.1038/ncomms9193
https://gup.ub.gu.se/file/184516
Keywords chiral magnet, spin-waves, torque, lattice, solitons, motion
Subject categories Physical Sciences

Abstract

Magnetic skyrmions are topologically non-trivial spin textures that manifest themselves as quasiparticles in ferromagnetic thin films or noncentrosymmetric bulk materials. So far attention has focused on skyrmions stabilized either by the Dzyaloshinskii-Moriya interaction (DMI) or by dipolar interaction, where in the latter case the excitations are known as bubble skyrmions. Here we demonstrate the existence of a dynamically stabilized skyrmion, which exists even when dipolar interactions and DMI are absent. We establish how such dynamic skyrmions can be nucleated, sustained and manipulated in an effectively lossless medium under a nanocontact. As quasiparticles, they can be transported between two nanocontacts in a nanowire, even in complete absence of DMI. Conversely, in the presence of DMI, we observe that the dynamical skyrmion experiences strong breathing. All of this points towards a wide range of skyrmion manipulation, which can be studied in a much wider class of materials than considered so far.

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