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The novel compatibility of SQUID magnetometry with ultrahigh vacuum chambers allows for measuring the magnetic moment with submonolayer sensitivity of the same ultrathin film before and after capping with a protective layer. The contributions of the surface and the interface magnetic layers can be separated. We show that the Co surface atoms carry a moment of 2.28μ B /atom enhanced by 32(5)% while the interface ones are reduced by 17(3)% to 1.43μ B /atom compared to the bulk value of 1.73μ B /atom. This surprisingly large difference between a vacuum facing Co surface and a Co/Cu interface is of fundamental importance.
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Ney et al. (2001) studied this question.
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