Abstract
We present the results of a systematic investigation of the thickness dependence of ultra-thin Co films on Cu(311) at room temperature using low energy electron diffraction and the magneto-optical Kerr effect. A superparamagnetic-ferromagnetic phase transition was observed to occur at a critical thickness of dc=4.0±0.25 ML and the magnetic susceptibility was to follow a power law with a critical exponent γ=1.103±0.069, in stark disagreement with results for Co on other Cu surfaces.
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