Thermal creation of skyrmions in ferromagnetic films with perpendicular anisotropy and Dzyaloshinskii-Moriya interaction
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
KAUST Grant NumberOSR-2016-CRG5-2977
Online Publication Date2019-08-26
Print Publication Date2020-01
Embargo End Date2021-08-26
Permanent link to this recordhttp://hdl.handle.net/10754/656795
MetadataShow full item record
AbstractWe study theoretically, via Monte Carlo simulations on lattices containing up to 1000×1000 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.
SponsorsThis work has been supported by the Grant No. OSR-2016-CRG5-2977 from King Abdullah University of Science and Technology.