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Spin‐Wave Damping in Uniaxial Ferromagnets at the Orientational Phase Transition
Author(s) -
Bulgakov E. N.,
Sadreev A. F.
Publication year - 1986
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.2221380216
Subject(s) - condensed matter physics , ferromagnetism , symmetry (geometry) , spin wave , phase diagram , physics , spin (aerodynamics) , phase (matter) , phase transition , magnetic damping , quantum mechanics , vibration , mathematics , geometry , thermodynamics
A damping of spin waves is considered near the orientational phase transition (OPT) in the easy plane ferromagnet in an external magnetic field using the diagram technique for the Hubbard operators. It is shown that in the normal phase where uniaxial symmetry is not broken the damping takes place for nonzero temperature and increases with approaching the OPT point. In the broken symmetry phase the damping of spin waves takes place even at T = 0 and increases with going away from the OPT point.