Abstract
Langevin simulations of cubic magnetic nanodots were performed using the Landau-Lifshitz equation with exchange and dipolar interactions. Vortices tend to organize as lines: we establish the structure and dynamics thereof for a large range of the dipolar versus exchange ratio d. These lines tend to be bent and twisted. For large values of the dipolar interaction, a complex network of vortex lines arises. Dynamics evidences low frequency collective gyrotropic motions of vortex lines which maintain their distance during motion.
Highlights
A tremendous amount of both experimental an theoretical work is being done on magnetic nanodots for obvious practical purposes such as data storage and manipulation, and from a fundamental viewpoint for their often challenging behavior.Since the first observations of Weiss domains [1], many investigations on the nature of these complex magnetic structures [2] and of their dynamical properties [3] were carried out
Vortex-core motion, usually the gyrotropic motion, is well known, it has been observed and calculated in various situations, and many times interpreted through the generic Thiele equations [64, 67, 69, 76]
In colour centres, an impurity acts as a perfectly localized extended atom or molecule, where the spatial extension is basically driven by the host dielectric constant [14], and the energy difference between electronic levels is reduced
Summary
A tremendous amount of both experimental an theoretical work is being done on magnetic nanodots for obvious practical purposes such as data storage and manipulation, and from a fundamental viewpoint for their often challenging behavior. The use of this cube as a mesh opens the path for a full study from an atomic nanocube up to a very large cubic sample, analysing in this way the transition from a single domain without vortex, up to a full set of vortices and domains, both on the viewpoints of structure and dynamics, when taking into account the complete screening effect of a complex magnetic structure This arrangement of domains and vortices is expected to occur [38,39,40], but the perfect lack of impurities and defects would be impossible to observe experimentally. Other interaction types could be introduced but we concentrate here on the effects of the dipole-dipole interaction
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