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This thesis deals with the propagation of spin waves fashionable thin Ni80Fe20 films. Its specific aims are to by experimentation determine a dispersal relation for propagating spin waves stylish thin ferromagnetic films, and to check phase velocities, grouping velocities and damping.
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How are spin waves used in ferromagnets?
The results constitute a generalization of previous theoretical studies on spin waves in thin films with uniaxial anisotropy and in semi-infinite ferromagnets with nonuniaxial anisotropy.;A spin Hamiltonian containing nearest-neighbour exchange terms, Zeeman terms, and single-ion anisotropy terms is used.
How is the formalism for spin waves developed?
The formalism is developed for arbitrary film thickness, arbitrary quantum spin number S, and perpendicular magnetization.
How is the Green function used in spin wave resonance?
The use of the Green function results in calculating the light scattering cross-sections and absorption strength in spin wave resonance is outlined. Procedures developed to manage the increased mathematical complication associated with the nonuniaxial anisotropy are described.
Last Update: Oct 2021