Physics – Condensed Matter – Materials Science
Scientific paper
2009-09-27
Physics
Condensed Matter
Materials Science
Scientific paper
In magnetic systems with reduced dimensionality, the effects of dipolar interactions allow the existence of long-range ordered phases. Long-range magnetic-dipolar interactions are at the heart of the explanation of many peculiar phenomena observed in nuclear magnetic resonance, ferromagnetic resonance, and Bose-Einstein-condensate structures. In this paper we show that magnetic-dipolar-modes (MDMs) in quasi-2D ferrite disks are characterized by symmetry breaking effects. Our analysis is based on postulates about a physical meaning of the magnetostatic-potential function as a complex scalar wave function, which presumes the long-range phase correlations. An important feature of the MDM oscillations in a ferrite disk concerns the fact that a structure with symmetric parameters and symmetric basic equations goes into eigenstates that are not space-time symmetric. The proper solutions are found based on an analysis of magnetostatic-wave propagation in a helical coordinate system. For a ferrite disk, we show that while a composition of two helical waves may acquire a geometrical phase over-running of during a period, every separate helical wave has a dynamical phase over-running of and so behaves as a double-valued function. We demonstrate that unique topological structures of the fields in a ferrite disk are intimately related to the symmetry breaking properties of MDM oscillations. The solutions give the MDM power-flow-density vortices with cores at the disk center and azimuthally running waves of magnetization. One can expect that the proposed models of long-range ordered phases and space-time violation properties of magnetic-dipolar interactions can be used in other magnetic structures, different from the ferromagnetic-resonance system with reduced dimensionality.
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