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Skyrmion glass in a 2D Heisenberg ferromagnet with quenched disorder


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Title Skyrmion glass in a 2D Heisenberg ferromagnet with quenched disorder
Title of Series New Journal of Physics, Volume 20, 2018
Author Chudnovsky, E. M.
Garanin, D. A.
License CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
DOI 10.5446/38877
Publisher Institute of Physics (IOP), Deutsche Physikalische Gesellschaft (DPG)
Release Date 2018
Language English

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Subject Area Physics
Abstract A 2D Heisenberg ferromagnet with exchange J and random magnetic anisotropy of strength has been studied. Analytical theory for the dependence of the average size of a pinned skyrmion on the magnetic field H, and for stability of such skyrmions on a lattice, has been developed. It has been complemented by numerical studies of 2D lattices containing up to 40 million spins. At low fields the average size of the skyrmion, λ, is determined by the average size of Imry–Ma domains. On increasing the field the skyrmions first shrink, with , and then collapse at fields distributed around . The concentration of the skyrmions goes down with the field as .

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