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Spin waves of anisotropic ferrimagnets with nearest neighbor and next‐nearest neighbor interactions
Author(s) -
Xue D. S.,
Gao M. Z.,
Yang J. B.,
Kong Y.,
Li F. S.
Publication year - 1996
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.2221930118
Subject(s) - k nearest neighbors algorithm , anisotropy , condensed matter physics , exchange interaction , spin (aerodynamics) , spectral line , heisenberg model , spin wave , physics , quantum mechanics , computer science , thermodynamics , antiferromagnetism , ferromagnetism , artificial intelligence
An anisotropic Heisenberg model with nearest neighbor and next‐nearest neighbor interactions is introduced to study the spin wave spectra of two‐sublattice ferrimagnets. The matrix Green function is applied to deal with the NaCl‐ and CsCl‐type ferrimagnets. The results show that the spin wave spectra separate into two branches, and the numerical calculation at finite temperature indicates that the absolute value of the spin wave energy increases with increasing extension and strength of the exchange interactions. It is found that the influences of the next‐nearest neighbor and anisotropic interactions are quite different. Simultaneously, the influences of the structure and the temperature are discussed.