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The Orientation Dependence of the Spin Wave Damping in Ferromagnetic Insulators with Spinel‐Structure
Author(s) -
Voigt F.
Publication year - 1967
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.19670230221
Subject(s) - condensed matter physics , anisotropy , ferromagnetic resonance , magnetization , ferromagnetism , materials science , spin wave , magnon , relaxation (psychology) , physics , optics , magnetic field , psychology , social psychology , quantum mechanics
Measurements are made of the relaxation frequencies of magnons at the minimum of the butterfly curve in parallel‐pumping experiments for some single crystals of ferrites and also for lithium ferrite. It is found that the anisotropic contribution to the relaxation frequency contains a large term of the sixth degree in the direction cosines of the magnetization with respect to the crystal axes. Callen and Pittelli have calculated the anisotropic ferromagnetic resonance line width in ferrites arising from the random variation of the intra‐atomic spin‐spin and spin‐orbit coupling parameters of the disordered ions. Their theory predicts a larger line width in the disordered state with a maximum in the [111] direction. The anisotropic contribution to the line width only contains a term of the fourth degree.