Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.28: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Structure and Electronic Properties of Fe3O4(111) on a Fe(110)/Mo(110)/Al2O3(1120) Substrate — •M. Fonin1, Yu. S. Dedkov1, G. Güntherodt1, U. Rüdiger2, and J. Mayer3 — 1II. Physikalisches Institut, Rheinisch-Westfälische Technische Hochschule Aachen, D-52056 Aachen, Germany — 2Fachbereich Physik, Universität Konstanz, D-78434, Konstanz, Germany — 3Gemeinschaftslabor für Elektronenmikroskopie, Rheinisch-Westfälische Technische Hochschule Aachen, 52056 Aachen, Germany
Since years ferromagnetic transition-metal oxide (TMO) films have been a subject of intensive research due to possible technical applications in various fields of technology. Highly spin-polarized TMO films, among them magnetite (Fe3O4) are claimed to have a large potential for future applications in magnetoelectronic devices.
Thin epitaxial Fe3O4(111) films have been prepared by in situ oxidation of thin Fe(110) films grown on Al2O3(1120) substrates using a Mo(110) buffer layer. Scanning tunneling microscopy images show a well-defined Fe3O4(111) surface. Well-controlled interface properties at the Fe(110)/Fe3O4(111) interface were confirmed by transmission electron microscopy. A high spin polarization value of about −(60±5)% was found near the Fermi energy at room temperature by means of spin-polarized photoelectron spectroscopy (hν=21.2 eV). The electronic structure and the spin polarization are compared to the corresponding values recently found on epitaxial Fe3O4(111) films grown on W(110) single crystal substrates.