Abstract
It has been recently shown that Co can grow epitaxially on an Au(1
1
1) layer with a face centered cubic (FCC) structure, the Co[1
1
1] and Au[1
1
1] axes being oriented along each other. First magneto-optical studies of the FCC Co film structure are reported here. The differences in magnetic behavior for FCC and HCP-type Co films as a function of the layer thickness are underlined and interpreted in the framework of a phenomenological model.