title: Ferromagnetic hcp chromium in Cr/Ru(0001) superlattices.
abstract: We report the first observation of a weak ferromagnetic state of Cr in Cr/Ru(0001) superlattices, based on magnetic hysteresis and corroborated by x-ray magnetic circular dichroism at the CrL(2,3) edges. In situ reflection high-energy electron diffraction, x-ray diffraction, and Cr K-edge polarized x-ray absorption investigations have shown that the Cr layers thinner than 8 angstroms adopt a slightly distorted hcp structure, accompanied by a large atomic volume expansion of up to 14% compared to the bcc packing volume. The expanded hcp structure clearly induces the observed ferromagnetism, in agreement with theory.
authors.affiliation: Department of Physics, University of Konstanz, D-78457 Konstanz, Germany. manfred.albrecht@uni-konstanz.de
authors.forename: M
authors.initials: M
authors.lastname: Albrecht
authors.forename: M
authors.initials: M
authors.lastname: Maret
authors.forename: J
authors.initials: J
authors.lastname: Kohler
authors.forename: B
authors.initials: B
authors.lastname: Gilles
authors.forename: R
authors.initials: R
authors.lastname: Poinsot
authors.forename: J L
authors.initials: JL
authors.lastname: Hazemann
authors.forename: J M
authors.initials: JM
authors.lastname: Tonnerre
authors.forename: C
authors.initials: C
authors.lastname: Teodorescu
authors.forename: E
authors.initials: E
authors.lastname: Bucher