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    Thermal Creation of Skyrmions in Ferromagnetic Films with Perpendicular Anisotropy and Dzyaloshinskii-Moriya Interaction

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    1906.05952.pdf
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    Type
    Article
    Authors
    Garanin, Dmitry A.
    Chudnovsky, Eugene M.
    Zhang, Senfu cc
    Zhang, Xixiang cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2016-CRG5-2977
    Date
    2019-06-13
    Online Publication Date
    2019-08-26
    Print Publication Date
    2020-01
    Permanent link to this record
    http://hdl.handle.net/10754/656795
    
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    Abstract
    We study theoretically, via Monte Carlo simulations on lattices containing up to 1000 x 1000 spins, thermal creation of skyrmion lattices in a 2D ferromagnetic film with perpendicular magnetic anisotropy and Dzyaloshinskii-Moriya interaction. At zero temperature, skyrmions only appear in the magnetization process in the presence of static disorder. Thermal fluctuations violate conservation of the topological charge and reduce the effective magnetic anisotropy that tends to suppress skyrmions. In accordance with recent experiments, we find that elevated temperatures assist the formation of skyrmion structures. Once such a structure is formed, it can be frozen into a regular skyrmion lattice by reducing the temperature. We investigate topological properties of skyrmion structures and find the average skyrmion size. Energies of domain and skyrmion states are computed. It is shown that skyrmion lattices have lower energy than labyrinth domains within a narrow field range.
    Citation
    Garanin, D. A., Chudnovsky, E. M., Zhang, S., & Zhang, X. (2020). Thermal creation of skyrmions in ferromagnetic films with perpendicular anisotropy and Dzyaloshinskii-Moriya interaction. Journal of Magnetism and Magnetic Materials, 493, 165724. doi:10.1016/j.jmmm.2019.165724
    Sponsors
    This work has been supported by the grant No. OSR2016-CRG5-2977 from King Abdullah University of Science and Technology.
    Publisher
    Elsevier
    Journal
    Journal of Magnetism and Magnetic Materials
    DOI
    10.1016/j.jmmm.2019.165724
    arXiv
    1906.05952
    Additional Links
    https://arxiv.org/pdf/1906.05952
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jmmm.2019.165724
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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