Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)
MA 13.51: Poster
Dienstag, 24. März 2009, 10:15–13:00, P1A
Interface and bulk magnetic properties of Laser-ablated Co2(Mn,Fe)Si films measured by X-ray magnetic circular dichroism (XMCD) — •Michael Kallmayer, Peter Klaer, Horst Schneider, Gerhard Jakob, and Hans Joachim Elmers — Universität Mainz, Institut für Physik, D-55128 Mainz, Germany
Heusler alloys with a predicted spin-polarization of 100% at the Fermi edge are currently of great interest. One of these half metallic ferromagnets is Co2(Mn,Fe)Si, which makes it a promising candidate for spintronic and TMR devices. For applications interface properties are of utmost importance. Using X-ray absorption spectroscopy, we measured the total electron yield (TEY), which provides a surface sensitive signal with a typical information depth of about 2-3 nm. Simultaneously, we measured the luminescence yield from the substrate. This signal integrates along the surface normal of the film and provides a bulk-like information. We investigated epitaxial films of Co2MnSi, Co2FeSi and Co2Mn0.5Fe0.5Si grown on MgO(100) via pulsed laser deposition. We find that the magnetic moments at the surface and in the bulk are similar and in good agreement with theoretical predictions. We discuss details of the spectral features in comparison with theoretical results.