title: Critical adsorption and dimensional crossover in epitaxial FeCo films
abstract: The critical behavior of thin FeCo films grown on MgO has been studied using phase-sensitive synchrotron x-ray diffraction. These studies unravel several novel features of criticality in thin films, as the simultaneous appearance of the 3D-2D crossover and the truncation of the correlation length normal to the film at approximately 1/3 of the film thickness. Above the critical temperature of the film we observe a pronounced pinning of the order parameter at the MgO-FeCo interface, which indicates a novel critical adsorption behavior.
authors.affiliation: Max-Planck-Institut fur Metallforschung, D-70569 Stuttgart, Germany and and Universitat Stuttgart, Institut fur Theoretische und Angewandte Physik, D-70569 Stuttgart, Germany.
authors.initials: B
authors.lastname: Nickel
authors.initials: W
authors.lastname: Donner
authors.initials: H
authors.lastname: Dosch
authors.initials: C
authors.lastname: Detlefs
authors.initials: G
authors.lastname: Grubel