Zinc oxide : From dilute magnetic doping to spin transport

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2014
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Opel, Matthias
Althammer, Matthias
Nielsen, Karl-Wilhelm
Karrer-Müller, Eva-Maria
Bauer, Sebastian
Senn, Konrad
Schwark, Christoph
Weier, Christian
Güntherodt, Gernot
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Physica Status Solidi (B) - Basic Solid State Physics. Wiley-Blackwell. 2014, 251(9), pp. 1700-1709. ISSN 0370-1972. eISSN 1521-3951. Available under: doi: 10.1002/pssb.201350230
Zusammenfassung

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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530 Physik
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dilute magnetic semiconductors, spin dephasing, spin transport, spintronics, zinc oxide
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ISO 690OPEL, Matthias, Sebastian T. B. GOENNENWEIN, 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. 2014, 251(9), pp. 1700-1709. ISSN 0370-1972. eISSN 1521-3951. Available under: doi: 10.1002/pssb.201350230
BibTex
@article{Opel2014oxide-53787,
  year={2014},
  doi={10.1002/pssb.201350230},
  title={Zinc oxide : From dilute magnetic doping to spin transport},
  number={9},
  volume={251},
  issn={0370-1972},
  journal={Physica Status Solidi (B) - Basic Solid State Physics},
  pages={1700--1709},
  author={Opel, Matthias and Goennenwein, 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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