Ferromagnetism in Mn-doped ZnO due to impurity bands |
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| Institution: | 1. Department of Neuropediatrics and Muscular Diseases, University Medical Center Freiburg, Mathildenstrasse 1, 79106 Freiburg, Germany;2. Medical Physics, University Medical Center Freiburg, Breisacher Straße 60a, 79106 Freiburg, Germany;3. Section for Epileptology, University Medical Center Freiburg, Breisacher Strasse 64, 79106 Freiburg, Germany;1. Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA;2. MR Center of Excellence, Department of Radiology, Medical University Vienna, Vienna, Austria;3. Department of Cardiovascular Medicine, John Radcliffe Hospital, University of Oxford Centre for Clinical Magnetic Resonance Research, Oxford, UK;4. Fetal-Neonatal Neuroimaging & Developmental Science Center, Boston Children''s Hospital, Harvard Medical School, Boston, MA, USA |
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| Abstract: | We have prepared quasi-homoepitaxial Zn0.95Mn0.05O-films on ZnO substrates by pulsed laser deposition. The thin films were characterized by in situ RHEED during growth, X-ray diffraction and reflectometry, as well as transmission electron microscopy (TEM). The magnetic properties have been analyzed by SQUID magnetometry and by measuring the anomalous Hall effect. By varying the growth conditions (substrate temperature: 200–600 ∘C, deposition atmospheres: Ar, O2) a different concentration of impurities has been generated. Our results show that the films are electron doped and exhibit a ferromagnetic coupling that depends on the impurity concentration. |
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