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Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 38: Multiferroics

MA 38.7: Talk

Thursday, March 26, 2009, 16:45–17:00, HSZ 103

Magnetic phase transition at a biferroic interface predicted from first principles — •Michael Fechner1, Igor Maznichenko2, Sergey Ostanin1, Arthur Ernst1, Jürgen Henk1, Patrick Bruno3, and Ingrid Mertig1,21MPI für Mikrostrukturphysik Halle, Germany — 2Martin-Luther-Universität Halle-Wittenberg, Germany — 3European Synchrotron Radiation Facility Grenoble, France

On the basis of first-principles electronic-structure calculations we predict that epitaxial multiferroic films—fabricated as ultrathin Fe films deposited on TiO2-terminated (001) surfaces of ATiO3 perovskites (A = Pb, Ba)—exhibit an unexpected change of their magnetic structure with increasing Fe-film thickness. The magnetic order changes from ferromagnetic, with a magnetization of about 3µB/atom for the 1-monolayer system, to ferrimagnetic with almost vanishing magnetization upon deposition of a second Fe layer. Ferromagnetic order is restored for thicker Fe films but with significantly reduced magnetization as compared to Fe bulk. The effect is understood in terms of hybridization of electronic states and geometric structure. The magnetoelectric coupling affects the size of the magnetic moments moderately, a spin-reorientation transition is not found.

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