Micromagnetic simulations study of skyrmions in magnetic FePt nanoelements

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:481

Article

Gergidis, Leonidas N.¹  Stavrou, Vasileios D.¹  Kourounis, Drosos²  Panagiotopoulos, Ioannis¹ 

[1] Univ Ioannina, Dept Mat Sci & Engn, GR-45110 Ioannina, Greece

[2] NEPLAN AG, CH-8700 Kusnacht, ZH, Peoples R China

关键词: Magnetic skyrmions;    Skyrmion number;    Magnetization reversal;    Magnetic vortices;    Micromagnetic simulations;    Magnetic nanoparticles;    Finite element simulations;   

DOI  :  10.1016/j.jmmm.2019.02.096

来源: Elsevier

【 摘 要 】

The magnetization reversal in 330 nm 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 vortex-like 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 simulation-based calculations of the skyrmion number S revealed that skyrmions can be created for magnetic nanoparticle systems lacking of chiral interactions such as Dzyaloshinsky-Moriya, but by only varying the magnetocrystalline anisotropy.

【 授权许可】

Free