Magnetic properties of ferromagnetic metal surface have been studied by Co 57 Mössbauer source measurements. On a surface of cobalt or copper, natural cobalt was electrolytically deposited and subsequently a microquantity of Co 57 was deposited under the same electrolytic condition. The Mössbauer spectrum at 4.2 K showed that the hyperfine field of Fe 57 in the surface of cobalt has a distribution ranging from 260 kOe to 350 kOe. This result suggests that the magnetic moment in the surface does not differ greatly from the bulk value.
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Shinjo et al. (1973) studied this question.
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