Excitation of vortices using linear and nonlinear magnetostatic waves

TL;DR

This paper demonstrates the excitation of stationary vortex structures in ferrite films using linear and nonlinear magnetostatic waves, with potential applications in microwave technologies.

Contribution

It introduces a novel method to create vortex structures in the cm and mm wavelength ranges using three-beam interactions in ferrite films.

Findings

Vortex structures can be excited in ferrite films using three-beam interactions.

Both linear and nonlinear vortex structures are achievable.

Control of vortex configurations is possible via parametric coupling in microwave resonators.

Abstract

It is shown that stationary vortex structures can be excited in a ferrite film. This is the first proposal for creating vortex structures in the important cm and mm wavelength ranges. It is shown that both linear and nonlinear structures can be excited using a three-beam interaction created with circular antennae. These give rise to a special phase distribution created by linear and nonlinear mixing. An interesting set of three clockwise rotating vortices joined by one counter-rotating one presents itself in the linear regime: a scenario that is only qualitatively changed by the onset of nonlinearity. It is pointed out that control of the vortex structure, through parametric coupling, based upon a microwave resonator, is possible and that there are many interesting possibilities for applications.