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The shape and width of the distribution of hyperfine fields in ferromagnetic iron and nickel sponge has been measured as a function of temperature using continuous wave NMR. The iron measurements are not in agreement with the theories of Friedel and de Gennes (1960) or of Suhl (1960). The apparent agreement for nickel may therefore be fortuitous.
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P. C. Riedi (1975) studied this question.
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