Kuchko A. Wave and magnetic inhomogeneities in spatial modulated structures

Generation, propagation, dispersion and damping of the spin waves in inhomogenous magnetic materials as well as dynamics of magnetic inhomogeneities in magnetics and superconductors were studied. Generation of the spin waves by local one-dimension defect of uniaxial anisotropy in homogenous in alternation external magnetic field was considered. The angle dependence of the dispersion amplitude of the spin waves on the dislocations was analyzed. The influence of the modulation of gyromagnetic ratio on the spectrum of a magnonic crystal was studied. Spectrum of the spin waves and the coefficient of the spatial damping in magnonic crystals with non-homogenous distribution of the dispersion parameters as well as in crystals with fuzzy interface as functions of modulation of the anisotropy value for different profiles of the interface and for the case of crystal with defects that break down the translation invariance of the material, were calculated. Characteristic time of relaxation was determined experimentally in the system of magnetic needle of the scanning tunnel microscope and the surface of magnetic film was shown. Dynamics of the Josephson vortex in superconductor with a system of paramagnetic ions was considered