The Fe/ZnO(0 0 0 1) interface: Formation and thermal stability |
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Authors: | D Wett A Demund R Szargan |
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Institution: | a Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstrasse 2, 04103 Leipzig, Germany b Institut für Experimentelle Physik II, Halbleiterphysik Universität Leipzig, Linnéstrasse 5, 04103 Leipzig, Germany |
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Abstract: | The room temperature growth mode and the interface reaction of Fe films on single crystalline ZnO(0 0 0 1) substrates prepared in ultra high vacuum (UHV) has been investigated by means of X-ray photoelectron and Auger electron spectroscopy (XPS, AES), low energy electron diffraction (LEED) and low energy ion scattering spectroscopy (LEIS). The results show that Fe grows in the pseudo layer-by-layer mode. At ambient temperature the deposited Fe film reduces the underlying ZnO single crystal resulting in FeO at the interface and metallic Zn, which partially diffuses into the remaining Fe overlayer. Annealing leads to a stepwise oxidation of the Fe to FeO (670 K) and Fe2O3 (820 K). The Fe2O3 mixes with the substrate resulting in two (1 1 1) oriented textures of a spinel phase found by electron backscatter diffraction analysis (EBSD). Fe-based spin-injection may play a vital role for ZnO-based spintronic devices. |
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Keywords: | Zinc oxide ZnO Iron Fe Iron oxide FeO Fe2O3 Interface Epitaxy Growth X-ray photoelectron spectroscopy XPS Low energy ion scattering LEIS Low energy electron diffraction LEED Electron backscatter diffraction EBSD |
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