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Article Dans Une Revue Physics Letters A Année : 2012

Temperature and vortex gyrotropic motion in 2-D magnetic nanodots by Langevin simulations

Résumé

Vortex gyrotropic motion was simulated in two-dimensional square magnetic dots of three-dimensional spin vectors of nanometric size. The Landau-Lifshitz equation with exchange and dipolar interactions was integrated at different temperatures with initial conditions consisting in a single vortex shifted aside from the central position. The gyrotropic frequency is computed. The experimental observation that this frequency decreases as temperature is increased is confirmed: we suggest that the reason is the thermal dependence of the damping coefficient in Thiele's equation. Pinning of the vortex-core motion by the underlying lattice is also observed. (C) 2012 Elsevier B.V. All rights reserved.

Dates et versions

hal-01243122 , version 1 (14-12-2015)

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Philippe Depondt, J. -C. S. Levy. Temperature and vortex gyrotropic motion in 2-D magnetic nanodots by Langevin simulations. Physics Letters A, 2012, 376 (45), pp.3411-3416. ⟨10.1016/j.physleta.2012.09.039⟩. ⟨hal-01243122⟩
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