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Epitaxial thin films of cobalt ranging from I ML up to ~O M L have been grown on a Cu(1W) Substrate and characterized by LEED. The cobalt is found to gmw, adopting a slight tetragonal distortion of its high-temperature fcc phase. Further growth of 5 ML Cu on lop of a SML CO film results in an almost perfect Cu(1W) surface.

Strong magnetic circular dichroism ͑MCD͒ has been observed in 4d core-level photoemission ͑PE͒ from magnetized Gd͑0001͒ metal, in agreement with an atomic many-particle description. This solves a longstanding controversy on the correct interpretation of the 4d PE spectrum of Gd. We show that MCD depends on the spin and orbital-momentum coupling in the final state, leading to MCD effects of opposite sign for high and low total angular momenta, respectively. The spin of the excited state can be assigned from MCD, and we discuss its role in the lifetime broadening of PE peaks.

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A consistent description of magnetic circular dichroism ͑MCD͒ in resonant 4d→4 f photoemission ͑PE͒ and 4d photoabsorption ͑PA͒ from magnetized rare-earth metals is presented. In the case of ferromagnetic Gd metal it is found that the MCD of the resonant 4f PE spectra varies strongly when the photon energy is scanned across the resonance region. We show that the spectral shape of the 4f PE multiplet is determined by the total angular momentum of the intermediate 4d 9 4f 8 PA state, which is reflected in the sign of the PA-MCD at the excitation energy.