Micromagnetic simulations study of skyrmions in magnetic FePt nanoelements
Abstract
The magnetization reversal in 330nm triangular prismatic magnetic nanoelements with variable magnetocrystalline anisotropy similar to that of partially chemically ordered FePt is studied using micromagnetic simulations employing Finite Element discretizations. Several magnetic properties including the evaluation of the magnetic skyrmion number S are computed in order to characterize magnetic configurations exhibiting vortexlike formations. Magnetic vortices and skyrmions are revealed in different systems generated by the variation of the magnitude and relative orientation of the magnetocrystalline anisotropy direction, with respect to the normal to the triangular prism base. Micromagnetic configurations with skyrmion number greater than one have been detected for the case where magnetocrystalline anisotropy was normal to nanoelement's base. For particular magnetocrystalline anisotropy values three distinct skyrmions are formed and persist for a range of external fields. The simulationbased calculations of the skyrmion number S revealed that skyrmions can be created for magnetic nanoparticle systems lacking of chiral interactions such as DzyaloshinskyMoriya, but by only varying the magnetocrystalline anisotropy.
 Publication:

Journal of Magnetism and Magnetic Materials
 Pub Date:
 July 2019
 DOI:
 10.1016/j.jmmm.2019.02.096
 arXiv:
 arXiv:1810.00253
 Bibcode:
 2019JMMM..481..111G
 Keywords:

 Magnetic skyrmions;
 Skyrmion number;
 Magnetization reversal;
 Magnetic vortices;
 Micromagnetic simulations;
 Magnetic nanoparticles;
 Finite element simulations;
 Physics  Computational Physics;
 Condensed Matter  Mesoscale and Nanoscale Physics;
 Mesoscale and Nanoscale Physics
 EPrint:
 12 pages, 13 figures, research article