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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.91: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Investigation of magnetic properties in a multiferroic layer system — •Martin Welke1, Remya Kunjuvettil Govind2, Martin Trautmann2, Vasili Hari Babu1, Karl-Michael Schindler2, and Reinhard Denecke1 — 1Wilhelm-Ostwald-Institut für Physikal. und Theoret. Chemie, Universität Leipzig, Linnestr. 2, 04103 Leipzig, Germany — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle, Germany
Systems with multiferroic properties are of interest for research since the 1960s. In the beginning single phase multiferroics were in the focus of research, whereas nowadays layer systems with a ferroelectric and a ferromagnetic component are investigated. The work presented covers the system Cobalt on Bariumtitanate (001) within SFB 762. In particular, XAS measurements of 3, 6, 9, 12, and 21 monolayer thick Co films prepared by e-beam evaporation are taken into account.
Magnetic properties are determined by X-ray magnetic circular dichroism (XMCD) at the Co L edge. The films show in-plane magnetization starting from 6 ML. It is possible to calculate the magnetic moments using the sum rule formalism. The calculated values correspond to those for Co (hcp) bulk reported in literature [1,2].
Changes to the BaTiO3 substrate by heating in vacuum up to 600 ∘C prior to Co deposition, resulting in O vacancies and increased conductivity, do not yield significant differences for the magnetic moments. Work supported by the DFG through SFB 762.
[1] Eriksson et al., Phys. Rev. B 42 (1990) 2707
[2] Guo et al., Phys. Rev. B 50 (1994) 3861