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Concentration dependence of the macroscopic magnetic anisotropy and of the ferrimagnetic line width in the gallium substituted europium iron garnet
Author(s) -
Foglio Mario E.
Publication year - 2009
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560050874
Subject(s) - ferrimagnetism , europium , anisotropy , gallium , condensed matter physics , lattice constant , field dependence , line width , relaxation (psychology) , chemistry , field (mathematics) , ion , materials science , magnetic field , physics , magnetization , quantum mechanics , mathematics , diffraction , social psychology , psychology , organic chemistry , pure mathematics , optics
Available experimental results on the dependence on concentration of the ferrimagnetic resonance of gallium substituted europium iron garnet, have been used to study the dependence on concentration of the macroscopic anisotropy constant K 1 and the ferrimagnetic line width Δ H . Instead of employing a strict molecular field theory, the probabilities of finding different numbers of Fe ions that are first and third nearest neighbors to each Eu have been used to derive Δ H and K 1 . This method is an extension of the statistical treatment introduced by Nowik and Ofer to study the Mossbauer spectra of the same substituted garnets. The statistical theory gives a better description of the dependence of K 1 on concentration than does a strict molecular field theory. Although the results obtained seem to indicate that the spin‐lattice relaxation of Eu in EuIG is independent of the exchange field H H that measures the Fe–Eu interaction, these results do not seem conclusive enough to reject a relaxation rate proportional to H 2 ex .