Space-time symmetry violation of the fields in quasi-2D ferrite particles with magnetic-dipolar-mode oscillations - Condensed Matter > Materials ScienceReport as inadecuate




Space-time symmetry violation of the fields in quasi-2D ferrite particles with magnetic-dipolar-mode oscillations - Condensed Matter > Materials Science - Download this document for free, or read online. Document in PDF available to download.

Abstract: In magnetic systems with reduced dimensionality, the effects of dipolarinteractions allow the existence of long-range ordered phases. Long-rangemagnetic-dipolar interactions are at the heart of the explanation of manypeculiar phenomena observed in nuclear magnetic resonance, ferromagneticresonance, and Bose-Einstein-condensate structures. In this paper we show thatmagnetic-dipolar-modes MDMs in quasi-2D ferrite disks are characterized bysymmetry breaking effects. Our analysis is based on postulates about a physicalmeaning of the magnetostatic-potential function as a complex scalar wavefunction, which presumes the long-range phase correlations. An importantfeature of the MDM oscillations in a ferrite disk concerns the fact that astructure with symmetric parameters and symmetric basic equations goes intoeigenstates that are not space-time symmetric. The proper solutions are foundbased on an analysis of magnetostatic-wave propagation in a helical coordinatesystem. For a ferrite disk, we show that while a composition of two helicalwaves may acquire a geometrical phase over-running of during a period, everyseparate helical wave has a dynamical phase over-running of and so behaves as adouble-valued function. We demonstrate that unique topological structures ofthe fields in a ferrite disk are intimately related to the symmetry breakingproperties of MDM oscillations. The solutions give the MDM power-flow-densityvortices with cores at the disk center and azimuthally running waves ofmagnetization. One can expect that the proposed models of long-range orderedphases and space-time violation properties of magnetic-dipolar interactions canbe used in other magnetic structures, different from theferromagnetic-resonance system with reduced dimensionality.



Author: E. O. Kamenetskii

Source: https://arxiv.org/







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