Anisotropy of the Hyperfine Field on 57Fe in Pure and Substituted Yttrium Iron Garnet |
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Authors: | H Štěpánková J Kohout J Englich P Novák |
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Institution: | (1) Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 40 Praha 8, Czech Republic;(2) Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovamickd 10, 162 53 Praha 6, Czech Republic |
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Abstract: | Using NMR, anisotropy of the hyperfine field on 57Fe nuclei was measured in Y3Fe5O12 with nonmagnetic, trivalent substitutions on d (Ga3+) and a (Y3+ - yttrium antisite defect) sites which are occupied by ferric ions in a pure, stoichiometric system. The measurements were
performed by the spin-echo method at liquid helium temperature. Thorough analysis of the hyperfine field anisotropy on the
57Fe nuclei in an ideal environment and in an environment where one of Fe3+ nearest cation neighbours is replaced by the nonmagnetic impurity is given. When the Fe3+ on which the NMR is measured is on the a site and the impurity is Ga3+(d), the results may be interpreted in terms of the superposition model. On the other hand, the results for Fe3+ on the d site and Y3+(a) are in clear disagreement with the predictions of this model.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | NMR hyperfine field ferrites |
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