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Type of Publication: | Journal article |
Publication status: | Published |
URI (citable link): | http://nbn-resolving.de/urn:nbn:de:bsz:352-2-knjz8d48dw5n4 |
Author: | Opel, Matthias; Gönnenwein, Sebastian T.B.; Althammer, Matthias; Nielsen, Karl-Wilhelm; Karrer-Müller, Eva-Maria; Bauer, Sebastian; Senn, Konrad; Schwark, Christoph; Weier, Christian; Güntherodt, Gernot et al. |
Year of publication: | 2014 |
Published in: | Physica Status Solidi (B) - Basic Solid State Physics ; 251 (2014), 9. - pp. 1700-1709. - Wiley-Blackwell. - ISSN 0370-1972. - eISSN 1521-3951 |
ArXiv-ID: | arXiv:1309.5857 |
DOI (citable link): | https://dx.doi.org/10.1002/pssb.201350230 |
Summary: |
During the past years there has been renewed interest in the wide-bandgap II-VI semiconductor ZnO, triggered by promising prospects for spintronic applications. First, ferromagnetism was predicted for dilute magnetic doping. In comprehensive investigation of ZnO:Co thin films based on the combined measurement of macroscopic and microscopic properties, we find no evidence for carrier-mediated itinerant ferromagnetism. Phase-pure, crystallographically excellent ZnO:Co is uniformly paramagnetic. Superparamagnetism arises when phase separation or defect formation occurs, due to nanometer-sized metallic precipitates. Other compounds like ZnO:(Li,Ni) and ZnO:Cu do not exhibit indication of ferromagnetism. Second, its small spin-orbit coupling and correspondingly large spin coherence length makes ZnO suitable for transporting or manipulating spins in spintronic devices. From optical pump/optical probe experiments, we find a spin dephasing time of the order of 15 ns at low temperatures which we attribute to electrons bound to Al donors. In all-electrical magnetotransport measurements, we successfully create and detect a spin-polarized ensemble of electrons and transport this spin information across several nanometers. We derive a spin lifetime of 2.6 ns for these itinerant spins at low temperatures, corresponding well to results from an electrical pump/optical probe experiment.
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Subject (DDC): | 530 Physics |
Keywords: | dilute magnetic semiconductors, spin dephasing, spin transport, spintronics, zinc oxide |
Link to License: | Attribution 3.0 Unported |
Refereed: | Yes |
OPEL, Matthias, Sebastian T.B. GÖNNENWEIN, Matthias ALTHAMMER, Karl-Wilhelm NIELSEN, Eva-Maria KARRER-MÜLLER, Sebastian BAUER, Konrad SENN, Christoph SCHWARK, Christian WEIER, Gernot GÜNTHERODT, 2014. Zinc oxide : From dilute magnetic doping to spin transport. In: Physica Status Solidi (B) - Basic Solid State Physics. Wiley-Blackwell. 251(9), pp. 1700-1709. ISSN 0370-1972. eISSN 1521-3951. Available under: doi: 10.1002/pssb.201350230
@article{Opel2014oxide-53787, title={Zinc oxide : From dilute magnetic doping to spin transport}, year={2014}, doi={10.1002/pssb.201350230}, number={9}, volume={251}, issn={0370-1972}, journal={Physica Status Solidi (B) - Basic Solid State Physics}, pages={1700--1709}, author={Opel, Matthias and Gönnenwein, Sebastian T.B. and Althammer, Matthias and Nielsen, Karl-Wilhelm and Karrer-Müller, Eva-Maria and Bauer, Sebastian and Senn, Konrad and Schwark, Christoph and Weier, Christian and Güntherodt, Gernot} }
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