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Spin‐wave spectra and magnetization of ferro–ferrimagnetic double layers
Author(s) -
Jiang Wei,
Wang Wei,
Zhang Fan,
Jiang Yuan,
Guo AnBang
Publication year - 2008
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.200743500
Subject(s) - condensed matter physics , ferrimagnetism , spin wave , spin (aerodynamics) , magnetization , spectral line , spins , ferromagnetism , exchange interaction , physics , frustration , wave function , chemistry , quantum mechanics , magnetic field , thermodynamics
The spin‐wave spectra and magnetization of the ferro–ferrimagnetic double layers are studied by using a linear spin‐wave approximation and retarded Green's‐function method. We obtain the four branches of the spin‐wave spectra. Two energy gaps are found to exist in the energy band. The effects of the interlayer exchange coupling, the intralayer exchange coupling and the spin quantum numbers on the spin‐wave spectra and the energy gaps are discussed. The minimum (maximum) value point on the spin‐wave spectra and energy gaps correspond to a system that has a high symmetrical magnetic structure and the balance of quantum competitions among the exchange couplings and the spin quantum numbers of the system. There is a crossover between sublattice magnetizations in ferromagnetic layer that is affected by quantum fluctuations, thermal fluctuations and frustration of spins. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)