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Spin polarization of Cu embedded in Fe70Co30 films has been investigated by means of transmission x-ray magnetic circular dichroism (XMCD). [Fe70Co30(dFeCo) / Cu(dCu)]n multilayered films were fabricated on Si-N membrane substrate, fixing total thickness of Fe-Co and Cu layers. Magneto-optical sum-rules were applied to the measured absorption and XMCD spectra to determine quantitatively the spin and orbital moments of Cu. With decreasing the Cu layer thickness, the spin moment of Cu increases but exhibits to be saturated about 0.1 μB / atom. The small value of spin moment (0.1 μB), comparing to that of the 3d transition metals such as Fe and Co, implies that only the top part of 3d down-spin band of Cu is unoccupied in these specimens.

Spin Polarization of Sub-monolayer Cu Embedded in Fe70Co30 Films