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

• Published in: Physics letters. A Vol. 375; no. 45; pp. 4085 - 4090
• Main Authors: Depondt, Ph, Lévy, J.-C.S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 31-10-2011; Elsevier
• Subjects: Condensed Matter; Fluid flow; Initial conditions; Magnetic properties and materials; Magnetic properties of nanostructures; Mathematical analysis; Numerical simulation studies; Out-of-equilibrium dynamic properties; Physics; Pinning; Simulation; Solid state physics; Vortex gyrotropic motion; Vortex precession; Vortices; Magnetic properties and materials; Out-of-equilibrium dynamic properties; Magnetic properties of nanostructures; Vortex gyrotropic motion; Numerical simulation studies
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2011.09.036

► Vortex precession was simulated in two-dimensional magnetic dots of finite size. ► A simple qualitative explanation of the observed behaviors is proposed, including seemingly erratic ones. ► Pinning of the vortex motion, unconnected with defects, is also observed and an explanation thereof provided.
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.