Berlin 2008 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Magnetic Thin Films I
MA 15.1: Talk
Tuesday, February 26, 2008, 10:30–10:45, H 1012
Magnetic properties of ultrathin Fe3Si films on MgO(001) and GaAs(001) — •Bernhard Krumme1, Claudia Weis1, Ellen Schuster1, Pankaj Srivastava1, Julia Kurde2, Subhankar Bedanta1, Marco Walterfang1, Ulrich von Hörsten1, Natalia Utochkina1, Wolfgang Kleemann1, Werner Keune1, and Heiko Wende1 — 1Universität Duisburg-Essen, Lotharstraße 1, D-47048 Duisburg, Germany — 2Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
Fe3Si is considered a promising candidate for future spintronic devices. Spininjection at room temperature has been demonstrated successfully. With its Curie temperature of TC=840 K well above room temperature it exhibits a high thermal stability. We present a combined XMCD, Mössbauer spectroscopy and SQUID investigation to analyze the magnetic properties of ultrathin Fe3Si films on MgO(001) and GaAs(001). From the XMCD measurements we derived a total Fe magnetic moment of about 1 µB on MgO while the total Fe magnetic moment on GaAs is smaller. These results agree well with the averaged moments from the SQUID investigation. We also determined the Fe spin and orbital moments. Together with the Mössbauer spectroscopy results we can conclude that the magnetical ordering on the MgO substrate is higher as compared to the GaAs substrate. One explanation for this result is a possible larger interdiffusion occurring on the GaAs substrate. This is consistent with a smaller averaged Fe spin moment for the GaAs substrate determined from XMCD.
– Supported by DFG (SFB 491) and BMBF (05 KS4 KEB/5).