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arXiv · 1710.03044

Heisenberg-exchange-free nanoskyrmion mosaic

E. A. Stepanov·S. A. Nikolaev·C. Dutreix·M. I. Katsnelson·V. V. Mazurenko
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Abstract

Isotropic Heisenberg exchange naturally appears as the main interaction in magnetism, usually favouring long-range spin-ordered phases. The anisotropic Dzyaloshinskii-Moriya interaction arises from relativistic corrections and is a priori much weaker, even though it may sufficiently compete with the isotropic one to yield new spin textures. Here, we challenge this well-established paradigm, and propose to explore a Heisenberg-exchange-free magnetic world. There, the Dzyaloshinskii-Moriya interaction induces magnetic frustration in two dimensions, from which the competition with an external magnetic field results in a new mechanism producing skyrmions of nanoscale size. The isolated nanoskyrmion can already be stabilized in a few-atom cluster, and may then be used as LEGO block to build a large magnetic mosaic. The realization of such topological spin nanotextures in sp- and p-electron compounds or in ultracold atomic gases would open a new route toward robust and compact magnetic memories.

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E. A. Stepanov, S. A. Nikolaev, C. Dutreix, M. I. Katsnelson, V. V. Mazurenko. 2017-10-09. Heisenberg-exchange-free nanoskyrmion mosaic. https://doi.org/10.1088/1361-648x/ab02b9

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