Collective dynamics of magnetic vortices in an array of interacting nanodots

Abstract

The lift of the degeneracy of the resonance frequency of motion of the core of a magnetic vortex in a square array of nanodots has been experimentally detected. The appearance of a frequency multiplet has been the oretically explained. It has been shown that a reason for the lift of degeneracy can be the magnetostatic inter action between nanodots.

On the Effect of Magnetostatic Interaction on the Collective Motion of Vortex Domain Walls in a Pair of Nanostripes

“…Hence, the effective forces acting on the vortex cores of stripes 1 and 2, as in the case of quasiparticles, can be written in the form (subscript is the stripe number and and are the radius vectors of the vortex centers in local systems of coordinates). In the estimations, it is convenient to use the rigid vortex model, in which the change in the magnetization distribution profile upon slight variation in the core coordinate is ignored . For the energy of the magnetic subsystem of a pair of stripes, we obtain …”

On the resonant state of magnetization in array of interacting nanodots

“…The arrays of circular and square nanodots for our studies were formed by the "lift-off" technique from a continuous film prepared with thermal sputtering from an 80HXC alloy on silicon substrate [16].…”

“…Here we present a refinement of the calculations from works [16] for 2D-array of nanodots. Let us consider a square 2D array of cylindrical nanodots with the centers separated by equal distance d .…”

Magnetic Vortices in Ferromagnetic Nanodots

“…In particular, the mechanism of creating the vortex-antivortex pair is still unclear. In addition, it is interesting to clarify the character of the nonlinear magnetic vortex oscillation and the effect of the magnetostatic interaction between nanodots in array on the oscillation modes [47][48][49][50][51].…”