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Anisotropic Ferromagnet with Biquadratic Exchange
Author(s) -
Chaddha G. S.,
Kalsi G. S.
Publication year - 1989
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.2221510133
Subject(s) - curie temperature , condensed matter physics , anisotropy , ferromagnetism , decoupling (probability) , exchange interaction , spin (aerodynamics) , physics , materials science , quantum mechanics , thermodynamics , control engineering , engineering
Effect of biquadratic exchange on Curie temperature of a spin‐1 ferromagnet with anisotropic exchange interaction is studied using the Green function approach in the Anderson‐Callen decoupling approximation. The variation of Curie temperature with biquadratic exchange interaction is calculated for crystal lattices of different coordination numbers and for spin systems of various anisotropy parameters of the exchange interaction. Anisotropy parameters for which biquadratic exchange interaction has no effect on the Curie temperature are determined. The results of various approaches are compared.