Abstract
We studied the electronic states and magnetic moments of a bcc-Co(001) monatomic layer facing an amorphous Al–O tunneling barrier using x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) at the L2,3 core edges of Co. Both the XAS and XMCD measurements revealed that 1 monolayer (ML) Co is not oxidized. The magnetic moment of 1 ML bcc Co(001) facing the amorphous Al–O was observed to be almost the same as that of bulk Co. In contrast, the total magnetic moment of 1 ML bcc Co(001) facing a metallic Al layer was reduced by the effect of the proximity to Al atoms.
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