Abstract
The magnetic and structural properties of Co films prepared on various substrates were investigated in situ based on the surface-magneto-optical Kerr effect (SMOKE) and using reflection high-energy electron diffraction (RHEED) and scanning tunneling microscopy (STM). The magnetic signals of the Co films were found to change significantly depending on the underlying substrates, the film thickness, and the temperature. Both STM and RHEED observations revealed that the shape and atomic structure of the Co islands were very different, which explains the observed magnetic anisotropy in SMOKE. We also observed a steep increase in coercivity for Co films thicker than 1.5 bi-layers grown on an Ag(111) film. This increase may be interpreted as a fcc-to-hcp structural transformation.
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