Spin-wave spectra and stability of the in-plane vortex state in two-dimensional magnetic nanorings

Journal Article · Sat Dec 21 00:00:00 EST 2013 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4851695· OSTI ID:22266195

Mamica, S., E-mail: [e-mail] ^[1]

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1. Faculty of Physics, Adam Mickiewicz University in Poznań, ul. Umultowska 85, 61-614 Poznań (Poland)

We study theoretically two-dimensional nanorings assumed to have the in-plane vortex magnetic configuration. Using a discrete dipole model we examine the spectrum of normal spin-wave modes vs. the dipolar-to-exchange interaction ratio. We systematize the spin-wave excitations by their azimuthal and radial wave numbers. The lowest-frequency mode, the fundamental (quasiuniform) mode, and the mode hybridization are analyzed; the discussion of the influence of effective pinning at the ring boundaries is provided as well. We study the stability of the in-plane vortex state and discuss the role of the size of the ring and the type of lattice arrangement of the magnetic moments within it. To facilitate comparison with our results we provide the relationships between microscopic parameters, used in our model, and those used in the case of continuous medium.

• OSTI ID: 22266195
• Journal Information: Journal of Applied Physics, Vol. 114, Issue 23; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONFIGURATION
DIPOLES
EXCHANGE INTERACTIONS
EXCITATION
HYBRIDIZATION
MAGNETIC MOMENTS
SPECTRA
SPIN WAVES
STABILITY
VORTICES