Magnetic-dipolar and electromagnetic vortices in quasi-2D ferrite disks

TL;DR

This paper investigates magnetic-dipolar-mode oscillations in quasi-2D ferrite disks, revealing topologically distinct vortices and their stability, supported by analytical and numerical evidence of electromagnetic vortices.

Contribution

It provides the first analytical and numerical demonstration of eigen magnetostatic power-flow-density vortices in ferrite disks, linking MDM states to electromagnetic vortices.

Findings

Eigen MS power-flow-density vortices exist in ferrite disks.

MDMs are characterized by MS energy eigen states.

Vortex stability differs from that in soft cylindrical dots.

Abstract

Magnetic-dipolar-mode (MDM) oscillations in a quasi-2D ferrite disk show unique dynamical symmetry properties resulting in appearance of topologically distinct structures. Based on the magnetostatic (MS) spectral problem solutions, in this paper we give an evidence for eigen MS power-flow-density vortices in a ferrite disk. Due to these circular eigen power flows, the MDMs are characterized by MS energy eigen states. It becomes evident that the reason of stability of the vortex configurations in saturated ferrite samples is completely different from the nature of stability in magnetically soft cylindrical dots. We found a clear correspondence between analytically derived MDM vortex states and numerically modeled electromagnetic vortices in quasi-2D ferrite disks.