The sign and magnitude of the antimony hyperfine field has been measured in Sb-substituted nickel ferrite using the ¹²¹Sb M\"ossbauer effect. We obtain a value of -311 ±{} 4 kG for this field at 100 K. This result is compared with results obtained for Sn in yttrium iron garnet and, among the possible mechanisms, 3d-5s covalent spin transfer appears to make the predominant contribution to the hyperfine field.
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Evans et al. (1972) studied this question.
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