Static and Dynamics of Topological Defects in Magnetic Dots
J.-C.S. Lévy
Laboratoire Matériaux et Phénomènes Quantiques, CNRS UMR 7162, Université Paris 7-Denis Diderot, 10 rue Alice Domont et Léonie Duquet, 75013 Paris, France
Received: May 24, 2008
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A Taylor expansion of dipole-dipole interaction in 2D systems defines a Landau like local dipolar interaction in spin derivative field. The lowest order of this interaction gives the dipolar anisotropy. The next non zero order is responsible for the appearance of magnetic vortices and hyperbolic defects. The following non zero orders indicate the occurrence of higher topological defects such as double circle and of modulations. The arrangement of self screened topological defects is discussed in agreement with the Monte Carlo simulations and experimental observations. Excited localized modes associated with these defects are classified.
DOI: 10.12693/APhysPolA.115.941
PACS numbers: 75.60.Ch, 75.75.+a