ARTIFICIAL 'MAGNETIC ATOMS' FOR MICROWAVE COMPOSITE MATERIALS

摘要

The so-called magnetostatic (MS) oscillations in ferrite samples have the wavelength much less than the electromagnetic wavelength at the same frequency and, at the same time, much more than the exchange-interaction spin wavelength. This intermediate position between the "pure" electromagnetic and spin-wave (exchange-interaction) processes reveals very special behaviors of the geometrical effects. It was shown recently that MS oscillations in a small ferrite disk resonator are described by the Schrodinger-like equation for MS-potential wave function and can be characterized by a discrete spectrum of energy levels. In this paper we give the results of energy spectrum calculations for MS oscillations in a ferrite disk resonator. Because of discrete energy eigenstates resulting from structural confinement in a special case of a normally magnetized ferrite disk, one can describe the oscillating system as a collective motion of quasi-particles - the light magnons.