Thermal Creation of Skyrmions in Ferromagnetic Films with Perpendicular Anisotropy and Dzyaloshinskii-Moriya Interaction
Type
ArticleKAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
KAUST Grant Number
OSR-2016-CRG5-2977Date
2019-06-13Online Publication Date
2019-08-26Print Publication Date
2020-01Permanent link to this record
http://hdl.handle.net/10754/656795
Metadata
Show full item recordAbstract
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.2019.165724Sponsors
This work has been supported by the grant No. OSR2016-CRG5-2977 from King Abdullah University of Science and Technology.Publisher
ElsevierarXiv
1906.05952Additional Links
https://arxiv.org/pdf/1906.05952ae974a485f413a2113503eed53cd6c53
10.1016/j.jmmm.2019.165724