Stability of the Landau state in square two-dimensional magnetic nanorings

We use a microscopic theory taking into account dipolar and nearest-neighbour exchange interactions to explore spin-wave excitations in two-dimensional square-shaped magnetic nanorings with the Landau state assumed as a magnetic state. From the spin-wave spectra, we determine the range of the dipola...

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Veröffentlicht in:Journal of applied physics 2012-08, Vol.112 (4)
Hauptverfasser: Mamica, S., Lévy, J.-C. S., Krawczyk, M., Depondt, Ph
Format: Artikel
Sprache:eng
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Zusammenfassung:We use a microscopic theory taking into account dipolar and nearest-neighbour exchange interactions to explore spin-wave excitations in two-dimensional square-shaped magnetic nanorings with the Landau state assumed as a magnetic state. From the spin-wave spectra, we determine the range of the dipolar-to-exchange interaction ratio in which the assumed state is stable. Various types of localized spin waves prove responsible for the transition to a new magnetic configuration. We found the transition forced by predominating exchange interactions size-independent in a wide range of both external and internal size of the ring.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4745875