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We have for the first time observed K-edge X-ray magnetic circular dichroism of submonolayer amounts of adsorbates on ferromagnetic thin metal films. The O K-edge X-ray magnetic circular dichroism (XMCD) of CO adsorbed on fcc Co grown epitaxially on Cu(001) showed a positive sign for the O1s →2 π* transition, which implies an opposite orbital moment of O to the Co magnetization.
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Amemiya et al. (2000) studied this question.
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