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O: Fachverband Oberflächenphysik

O 14: Surface or Interface Magnetism

O 14.1: Talk

Monday, February 25, 2008, 15:15–15:30, MA 043

Structure and magnetism in nanoscale FeCo alloys — •Stefanos Tzivanakis, Alejandro Diaz-Ortiz, and Helmut Dosch — Max-Planck-Institut für Metallforschung, Stuttgart, Germany

The interplay between dimensionality, ordering and magnetism has been investigated on two-dimensional Fe-Co alloys. Our first-principles density-functional calculations on free-standing and Mo supported alloys show a linear dependence of the magnetic moment with atomic concentration and lattice constant. Lattice strain and charge transfer play a fundamental role in determining the magnetism and phase stability of two-dimensional Fe-Co alloys. Cluster expansions for the energy and the magnetic moment were used to exhaustively search ground-state and large-magnetic-moment configurations.