Abstract
A simple theory of hyperfine field seen by a positive muon at an interstitial site in ferromagnetic materials is presented. The ferromagnetic host is characterized by a free electron conduction band of sp‐electrons and localied d‐electrons. The theory is extended to study hyperfine fields at interstitial atomic impurities in ferromagnetic hosts. The field systematics are seen to arise from the screening of the impurity charge. Hyperfine fields at interstitial muon sites in Fe, Co and Ni and interstitial Li, Be, B, C, N, O, F and Ne sites in Ni are calculated and compared with most recent experimental data.
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