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Energy spectrum, magnetization, and critical field of the uniaxial two‐sublattice ferrimagnet by the Green function method
Author(s) -
Kazakov A. A.,
Litvinenko N. A.
Publication year - 1979
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.2220950202
Subject(s) - ferrimagnetism , condensed matter physics , magnetization , anisotropy , field (mathematics) , energy spectrum , physics , spectrum (functional analysis) , critical field , magnetic anisotropy , anisotropy energy , magnetic field , energy (signal processing) , quantum mechanics , mathematics , superconductivity , pure mathematics
The energy spectrum and the magnetization of an uniaxial two‐sublattice ferrimagnet in all intervals of fields and temperatures are calculated by the method of two times Green temperature functions both, in easy and hard directions. It is shown that the long‐wave spectrum of elementary excitations can “oscillate” depending on the value of the external magnetic field. It leads to the fact that in the region of critical fields and low temperatures the magnetization of system follows the simple power law T 2 in the plane and T 3/2 along the axis independently from the type of ferrimagnet anisotropy.