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Article Dans Une Revue Journal of Nanoparticle Research Année : 2011

The effect of the single-spin defect on the stability of the in-plane vortex state in 2D magnetic nanodots

S. Mamica
  • Fonction : Auteur
Philippe Depondt
M. Krawczyk
  • Fonction : Auteur

Résumé

The aim of this study is to analyse the stability of the single in-plane vortex state in two-dimensional magnetic nanodots with a nonmagnetic impurity (single-spin defect) at the centre. Small square and circular dots including up to a few thousand of spins are studied by means of a microscopic theory with nearest-neighbour exchange interactions and dipolar interactions fully taken into account. We calculate the spin-wave frequencies versus the dipolar-to-exchange interaction ratio d to find the values of d for which the assumed state is stable. Transitions to other states and their dependence on d and the vortex size are investigated as well, with two types of transition found: vortex core formation for small d values (strong exchange interactions), and in-plane reorientation of spins for large d values (strong dipolar interactions). Various types of localized spin waves responsible for these transitions are identified.

Dates et versions

hal-01243128 , version 1 (14-12-2015)

Identifiants

Citer

S. Mamica, J. -C. S. Levy, Philippe Depondt, M. Krawczyk. The effect of the single-spin defect on the stability of the in-plane vortex state in 2D magnetic nanodots. Journal of Nanoparticle Research, 2011, 13 (11, SI), pp.6075-6083. ⟨10.1007/s11051-011-0308-0⟩. ⟨hal-01243128⟩
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