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Spin Waves in a Semi‐Infinite Field‐Induced Metamagnet with Three‐Ion Anisotropic Interactions II. Application to FeBr 2 and FeCl 2
Author(s) -
Rudziński W.,
Maciejewski W.
Publication year - 1993
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.2221750121
Subject(s) - anisotropy , antiferromagnetism , condensed matter physics , paramagnetism , ion , dispersion (optics) , spin (aerodynamics) , spin wave , field (mathematics) , surface (topology) , chemistry , phase (matter) , materials science , physics , thermodynamics , optics , ferromagnetism , organic chemistry , geometry , mathematics , pure mathematics
Theoretical results for surface and bulk spin‐wave dispersion relations derived in the first paper of this series are applied to field‐induced metamagnets FeBr 2 and FeCl 2 with a (001) surface. The effect of the three‐ion anisotropy on the surface excitations is examined numerically for both the antiferromagnetic and paramagnetic phases. The obtained results contain modifications of the frequency separation between the surface and bulk modes. Moreover, by allowing the surface three‐ion anisotropy field to differ from the bulk value it is found that in the paramagnetic phase besides optical‐type solutions evaluated in recent analysis of FeBr 2 and FeCl 2 (001) surface, acoustic‐type surface branches may also occur. A comparison of the results obtained for FeBr 2 and FeCl 2 confirms the essential influence of the crystal structure on the behaviour of surface spin waves.