We have used in situ polar Kerr effect measurements to probe directly the magnetic anisotropy of ultrathin MBE-grown Co films with and without overlayers of various nonmagnetic metals (X=Ag, Cu, Pd). To investigate the Co/X interface, we measured perpendicular hysteresis curves as a function of overlayer coverage. We find the magnitude of the perpendicular anisotropy is strongly peaked near {~}1 atomic layer (1.5--2 {}) coverage for Ag and Cu overlayers. For Cu, the overlayer with the strongest effect, the total anisotropy energy rapidly decreases by a factor of 3 from its peak value after a total coverage of only {~}2 atomic layers (4 {}) of Cu.
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Engel et al. (1993) studied this question.
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