Vortices and chirality of magnetostatic modes in quasi-2D ferrite disk particles

TL;DR

This paper demonstrates that vortex states and chiral edge modes can exist in large, magnetically saturated ferrite disks due to magnetic-dipolar interactions, expanding understanding of magnetostatic mode phenomena in quasi-2D structures.

Contribution

It reveals the formation of vortex states and chiral edge modes in large ferrite disks driven by magnetic-dipolar interactions, not just in small soft magnetic dots.

Findings

Vortex states can be created in large, saturated ferrite disks.

Magnetostatic modes exhibit phase singularities and vortex structures.

Chiral edge states guarantee vortex formation in quasi-2D ferrite disks.

Abstract

In this paper we show that the vortex states can be created not only in magnetically soft "small" (with the dipolar and exchange energy competition) cylindrical dots, but also in magnetically saturated "big" (when the exchange is neglected) cylindrical dots. A property associated with a vortex structure becomes evident from an analysis of confinement phenomena of magnetic oscillations in a ferrite disk with a dominating role of magnetic-dipolar (non-exchange-interaction) spectra. In this case the scalar (magnetostatic-potential) wave functions may have a phase singularity in a center of a dot. A non-zero azimuth component of the flow velocity demonstrates the vortex structure. The vortices are guaranteed by the chiral edge states of magnetic-dipolar modes in a quasi-2D ferrite disk.