Dresden 2009 – wissenschaftliches Programm
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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 13.45: Poster
Dienstag, 24. März 2009, 10:15–13:00, P1A
MBE growth of Fe3O4 films on ZnO — •Markus Paul1,2, Nicholas Ingle2, Andreas Müller1, Andreas Ruff1, Michael Sing1, and Ralph Claessen1 — 1Lehrstuhl für Experimentelle Physik 4, Universität Würzburg, Germany — 2AMPEL, University of British Columbia, Vancouver, Canada
Magnetite (Fe3O4) is ranked among the promising materials as spin-injector into a semiconducting host. Its ferrimagnetic behaviour with a high Curie temperature of about 850 K, the small conductivity mismatch to semiconductors and its theoretically predicted high spin polarization at EF are very attractive for this goal. The deposition of magnetite thin fims on ZnO presents a further step towards integration of magnetic materials into semiconductor technology.
We have investigated the MBE growth behaviour and properties of Fe3O4 thin films on ZnO with various techniques. Growth proceeds as a mixed layer and island growth for typical film thicknesses ranging from 10 to 30 nm. LEED, RHEED and XRD results demonstrate (111) oriented deposition with an epitaxial relationship of Fe3O4⟨110⟩|| ZnO⟨211⟩. XPS and HAXPES spectra reveal small changes in Fe and Zn chemical environments with varying probing depth. UPS measurements are in agreement with results obtained on single crystals showing no spectral weight at EF.