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The spin‐flop transition in some two‐sublattice uniaxial antiferromagnets
Author(s) -
Morrison B. R.
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.2220590225
Subject(s) - condensed matter physics , anisotropy , isotropy , spin (aerodynamics) , antisymmetric relation , physics , ion , field (mathematics) , zero (linguistics) , quantum mechanics , mathematical physics , mathematics , thermodynamics , philosophy , linguistics , pure mathematics
The spin‐flop transition has been reconsidered in the molecular‐field approximation at 0 K. A general free energy expression, which includes isotropic and anisotropic exchange, first and second uniaxial single‐ion anisotropy, and Dzyaloshinsky‐Moriya antisymmetric exchange, is the starting point for the calculations. Both exact and approximate relations are derived for the critical fields. By setting the appropriate parameters equal to zero these relations are readily reduced to the corresponding equations for better known simpler systems. An expression is found for the angular dependence of the spin‐flop transition, and the importance of second uniaxial single‐ion anisotropy is discussed.