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Information × Registration Number 0211U007158, 0110U004101 , R & D reports Title The spin dynamics of magnetic functional structures in the scales of nanometrs and picoseconds popup.stage_title Head Ivanov Ivanov, Registration Date 30-03-2011 Organization Institute of magnetism of NASU popup.description2 A theoretical description of the experiment on ferromagnetic resonance in square arrays of cylindrical permalloy dots with different distances between the points was implemented. The observed spin excitations exhibit complicated dependence of their frequency on the interaction magnitude between the dots. A significant effect of distance between points on the vortex gyrotropic frequency and the frequency splitting of azimuthal spin waves was revealed. Gyrotropic frequency, as well as the splitting of the first azimuthal doublet exhibit nonmonotonic dependence on the distance between the points, while the splitting of the second doublet is monotonic. The observed effects are explained by the influence of both the dipole and quadrupole contributions to the dynamics of the magnetostatic interaction. Based on our proposed new mechanism of action of ultrashort pulses of magnetic field on the spin system we foreknew the excitation of spin waves for nematic phase magnets with spin S = 1 and S = 3 / 2. An analytical theory that (for the data of numerical simulation of the magnon frequencies for isolated nanoparticles) allows us to describe the spectrum of collective modes of ensembles of such particles. The phase diagram and the theory of dynamical properties of lattices of magnetic particles with arbitrary anisotropy was developed. Product Description popup.authors Іванов Б.О. Бондаренко П.В. Киреєв В.Є. Колежук О.К. Тартаківська О.В. Химин Р.С. popup.nrat_date 2020-04-02 Close