Microwave whirlpools in a rectangular-waveguide cavity with a thin ferrite disk

TL;DR

This paper investigates microwave wave phenomena in a rectangular waveguide with a thin ferrite disk, revealing whirlpool-like electromagnetic vortices near ferromagnetic resonance through numerical Maxwell solutions.

Contribution

It demonstrates the formation of electromagnetic whirlpools caused by gyrotropy and resonance effects in a waveguide with a ferrite disk, highlighting symmetry breaking and loss influences.

Findings

Whirlpool-like electromagnetic vortices form near ferromagnetic resonance.

Wave phenomena are analyzed through full Maxwell-equation numerical solutions.

Ohmic and magnetic losses affect vortex characteristics.

Abstract

We study a three dimensional system of a rectangular-waveguide resonator with an inserted thin ferrite disk. The interplay of reflection and transmission at the disk interfaces together with material gyrotropy effect, gives rise to a rich variety of wave phenomena. We analyze the wave propagation based on full Maxwell-equation numerical solutions of the problem. We show that the power-flow lines of the microwave-cavity field interacting with a ferrite disk, in the proximity of its ferromagnetic resonance, form whirlpool-like electromagnetic vortices. Such vortices are characterized by the dynamical symmetry breaking. The role of ohmic losses in waveguide walls and dielectric and magnetic losses in a disk is a subject of our investigations.