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Classical Theory of a Metamagnet with Temperature‐Dependent Anisotropy
Author(s) -
Michalski K. J.,
Reich W.,
Cofta H.
Publication year - 1980
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.2220970120
Subject(s) - condensed matter physics , metamagnetism , isotropy , anisotropy , magnetization , phenomenological model , phase (matter) , constant (computer programming) , thermodynamics , materials science , coupling (piping) , phase transition , physics , magnetic field , quantum mechanics , computer science , programming language , metallurgy
The collinear, two‐sublattice metamagnet with thermal dependence of the magnetic anisotropy parameter but with constant parameter of the inter‐sublattice isotropic exchange coupling is investigated in classical approximation. Using Pál's form of the phenomenological free energy, the magnetization curves for both m T ( h ) and m h ( T ) processes are derived. The possibility of occurrence of the spontaneous metamagnetism is demonstrated and its criterion is derived. Moreover, the stable oblique phase is studied, exhibiting new interesting abrupt magnetic transitions on its phase boundaries. Some rules for the accompanying volume jumps are established.