Dynamics and Topology of Micromagnetic Vortices

Alberto Verga (1, 2)

1 CPT - Centre de Physique Théorique - UMR 7332
2 CPT - E6 Nanophysique

Magnetic vortices are topologically stable magnetization configurations at the nanoscale. When subject to a current polarized in spin, exchange interaction with the itinerant electrons, modify the configuration of the fixed spins. The spin-transfer torque effect, as experimentally observed, is able to change the magnetization topology. We investigate the relation between the dynamics of magnetic vortices driven by a spin-polarized current and the changes in the magnetization topology. These transitions are characterized by the appearance of magnetic singularities.

Mots clés: Magnetism; Magnetic Vortices; Landau-Lifshitz equation; Spin- transfer torque; Magnetic singularities

Domaines: Matière Condensée [cond-mat]

Alberto Verga. Dynamics and Topology of Micromagnetic Vortices. Chaos, Complexity and Transport CCT'15, Jun 2015, Marseille, France. pp.54 - 82, ⟨10.1142/9789813202740_0002⟩. ⟨hal-01500461⟩