Magnetism of ordered Sm/Co(0001) surface structures
arXiv:cond-mat/0506181 · doi:10.1103/PhysRevB.72.092409
Abstract
The epitaxial system Sm/Co(0001) was studied for Sm coverages up to 1 monolayer (ML) on top of ultrathin Co/W(110) epitaxial films. Two ordered phases were found for 1/3 and 1 ML Sm, respectively. The valence state of Sm was determined by means of photoemission and magnetic properties were measured by magneto-optical Kerr effect. We find that 1 ML Sm causes a strong increase of the coercivity with respect to that of the underlying 10 ML Co film. Element-specific hysteresis loops, measured by using resonant soft x-ray reflectivity, show the same magnetic behaviour for the two elements.
4 pages, 5 figures. Accepted version, minor changes: discussion of soft x-ray reflectivity spectra included, references added