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Spin Wave Spectrum and Magnetization of Magnetic Thin Films with a Rough Surface
Author(s) -
Freese H.,
Krey U.
Publication year - 1973
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220550123
Subject(s) - condensed matter physics , magnetization , spin wave , magnon , scattering , surface roughness , hamiltonian (control theory) , surface finish , amplitude , thin film , materials science , physics , ferromagnetism , magnetic field , quantum mechanics , mathematics , mathematical optimization , composite material
The influence of the surface roughness on the low energy spin wave properties is treated within a quantized phenomenological spin wave theory. Up to second order in the roughness amplitude, the surface roughness can be replaced for thin films by a non‐local scattering Hamiltonian acting in two dimensions. For a surface with a random “mosaic structure”, results are obtained for the self‐energy of the magnons, for the density of states g(E), and for the magnetization as function of the temperature T. For rough films, due to the properties of g(E), the magnetization decreases faster with T than for a smooth film of equal thickness.