2017/10/29 by Eugene M. Chudnovsky, E. M. Chudnovsky, Chudnovsky, E. M. +2
Engineering · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #Condensed matter physics #FOS: Physical sciences #Materials science #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics #Skyrmion #cond-mat.mes-hall
paper · pdf · doi:10.48550/arxiv.1710.10608
6 pages, 6 figures
arxiv created 2017/10/29 · openalex publication_date 2017/10/29 · arxiv updated 2017/10/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We show that high concentration of skyrmions can be achieved in magnetic films with quenched disorder. A 2D system of Heisenberg spins with feromagnetic exchange, J, and random magnetic anisotropy of strength DR ≪ J has been studied. Analytical theory for the dependence of the average skyrmion size on the magnetic field H, and for the stability of pinned skyrmions, is 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 λ∝ DR/H, and then collapse at fields distributed around Hc ∝ DR4/3. Concentration of the skyrmions goes down with the field as exp[-(H/Hc)3/2].