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

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Abstract

Microwave vortices in ferrite particles can appear in different kinds of physical phenomena depending on space scales of the wave processes. 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 fluctuations are neglected) cylindrical dots. A property associated with a vortex structure becomes evident from an analysis of confinement phenomena of magnetic oscillations in a ferrite disc with a dominating role of magnetic-dipolar (non-exchange-interaction) spectra. In this case, the scalar (magnetostatic-potential) wavefunctions may have a phase singularity in the centre 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 disc.

Original languageEnglish
Article number017
Pages (from-to)6539-6559
Number of pages21
JournalJournal of Physics A: Mathematical and Theoretical
Volume40
Issue number24
DOIs
StatePublished - 15 Jun 2007

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