Excitation modes of vortices in sub-micron magnetic disks
arXiv:1209.1375 · doi:10.1103/PhysRevB.87.014413
Abstract
Classical and quantum theory of spin waves in the vortex state of a mesoscopic sub-micron magnetic disk has been developed with account of the finite mass density of the vortex. Oscillations of the vortex core resemble oscillations of a charged string in a potential well in the presence of the magnetic field. Conventional gyroscopic frequency appears as a gap in the spectrum of spin waves of the vortex. The mass of the vortex has been computed that agrees with experimental findings. Finite vortex mass generates a high-frequency branch of spin waves. Effects of the external magnetic field and dissipation have been addressed.
12 pages
References in corpus (4)
- Magnetic Vortex Resonance in Patterned Ferromagnetic Dots
- Bistability of vortex core dynamics in a single perpendicularly magnetized nano-disk
- Low-frequency vortex dynamic susceptibility and relaxation in mesoscopic ferromagnetic dots
- Quantum depinning of the magnetic vortex core in micron-size permalloy disks