Small amplitude oscillations of sine-gordon vortex states in planar magnets in three dimensions
AUTOR(ES)
Pereira, A . R.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2002-09
RESUMO
We investigate the spectrum of small amplitude oscillations of the sine-Gordon vortex-antivortex pair in layered ferromagnetic systems described by the anisotropic three-dimensional XY-model. In the case of a small interlayer coupling constant, vortex-pairs can be formed independently in each plane. Analytical expressions for two discrete modes with zero frequency are obtained. These zero modes are associated with the two-dimensional motion of the excitation on an individual plane and are important because the interference between them and a vortex-pair gives rise to contributions to the central peak. The continuum states, which contribute to EPR linewidth, are derived using the Born approximation.
Documentos Relacionados
- Bäcklund transformations for multidimensional sine-Gordon equations
- Collective coordinate analysis for double sine-Gordon model
- Electronic structure of multiquantum giant vortex states in mesoscopic superconducting disks
- Application of neodymuim-iron-boron permanent magnets on the assembling of a novel planar actuator
- Large amplitude oscillations for a class of symmetric polynomial differential systems in R³