title: Stabilization of metastable expanded face-centered-tetragonal manganese.
abstract: The structural and magnetic properties of Mn prepared on single crystalline face-centered-tetragonal (fct) Co(001) were investigated. Mn grows coherently up to at least 50 monolayers (ML) and adopts a metastable expanded fct(001) phase [c/a = 1.055(5)]. This new fct-Mn phase was recently predicted theoretically by Hafner and Spisák. Studies of magnetic Mn/Co interface exchange interactions prove the room temperature antiferromagnetic state for thicknesses above 2.5 ML. The magnetic anisotropy of the thin Mn is high enough to induce a significant exchange anisotropy for Mn thicknesses as low as 6 ML. The potential of fct-Mn to become a novel model system for systematic studies on the exchange interactions at antiferromagnet/ferromagnet interfaces is discussed.
authors.affiliation: Eindhoven University of Technology, Department of Applied Physics and center for NanoMaterials (cNM), P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
authors.forename: J T
authors.initials: JT
authors.lastname: Kohlhepp
authors.forename: W J M
authors.initials: WJ
authors.lastname: de Jonge