title: Crystallographic structure of ultrathin Fe films on Cu(100).
abstract: We report the observation of bcc-like crystal structures in 2-4 monolayer (ML) Fe films grown on fcc Cu(100) using scanning tunneling microscopy. The local bcc structure provides a straightforward explanation for their frequently reported outstanding magnetic properties, i.e., ferromagnetic ordering in all layers with a Curie temperature above 300 K. The nonpseudomorphic structure, which becomes pseudomorphic above 4 ML film thickness, is unexpected in terms of conventional rules of thin film growth and stresses the importance of finite thickness effects in ferromagnetic ultrathin films.
authors.affiliation: Institut für Allgemeine Physik, Vienna University of Technology, A-1040 Vienna, Austria.
authors.forename: A
authors.initials: A
authors.lastname: Biedermann
authors.forename: R
authors.initials: R
authors.lastname: Tscheliessnig
authors.forename: M
authors.initials: M
authors.lastname: Schmid
authors.forename: P
authors.initials: P
authors.lastname: Varga