Theory of current-driven skyrmions in disordered magnets.

ABSTRACT: An emergent topological particle in magnets, skyrmion, has several unique features distinct from the other magnetic textures such as domain wall, helical structure, and vortex. It is characterized by a topological integer called skyrmion number N _sk , which counts how many times the directions of the magnetic moments wrap the unit sphere. This N _sk gives the chiral nature of the skyrmion dynamics, and leads to the extremely small critical current density j _c for the current-driven motion in terms of spin transfer torque effect. The finite j _c indicates the pinning effect due to the disorder such as impurities and defects, and the behaviors of skyrmions under disorder have not been explored well theoretically although it is always relevant in real

SUBMITTER: Koshibae W 

PROVIDER: S-EPMC5910446 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature