Spin-dynamics simulations of vortex precession in 2-D magnetic dots

Philippe Depondt (1) , J. -C. S. Levy

1 INSP - Institut des Nanosciences de Paris

Vortex precession was simulated in two-dimensional magnetic dots. The Landau-Lifshitz equation with exchange and dipolar interactions was integrated at a low temperature with initial conditions consisting in a single vortex situated aside from the central position. This vortex precesses around the center of the sample and either can be expelled or converges towards the center. These relaxation processes are systematically studied. A simple qualitative explanation of the observed behaviors is proposed, including seemingly somewhat erratic ones. Intrinsic pinning of the vortex motion, unconnected with defects, is also observed and an explanation thereof provided. (C) 2011 Elsevier B.V. All rights reserved.

Mots clés: Magnetic properties and materials; Out-of-equilibrium dynamic properties; Numerical simulation studies; Magnetic properties of nanostructures; Vortex gyrotropic motion

Domaines: Matière Condensée [cond-mat]

Philippe Depondt, J. -C. S. Levy. Spin-dynamics simulations of vortex precession in 2-D magnetic dots. Physics Letters A, 2011, 375 (45), pp.4085-4090. ⟨10.1016/j.physleta.2011.09.036⟩. ⟨hal-01241534⟩