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Contribution of the Fe 2+ ion to the magnetic anisotropy constant in ferrites
Author(s) -
Watanabe Y.,
Urade K.,
Saito S.
Publication year - 1978
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.2220900231
Subject(s) - anisotropy , ion , lattice constant , condensed matter physics , magnetic anisotropy , constant (computer programming) , materials science , lattice (music) , chemistry , analytical chemistry (journal) , physics , magnetization , magnetic field , diffraction , organic chemistry , quantum mechanics , computer science , acoustics , programming language , chromatography , optics
The magnetic anisotropy constant K 1 originating from the presence of Fe 2+ ions in ferrites is calculated, using the theory of Wolf, for a case that the electron hopping between Fe 2+ and Fe 3+ ions is allowed within a cluster of iron ions around some lattice defects. The calculated value of K 1 exhibits a characteristic temperature dependence, i.e. the change of the sign from positive at lower temperatures to negative at higher temperatures. It is shown that the result well agrees with the Fe 2+ contribution to K 1 estimated from the available data of the anisotropy constant for the Ni 1− x Fe 2+ x O 4 system.