Spin-on Spintronics : Ultrafast Electron Spin Dynamics in ZnO and Zn1-xCoxO Sol-Gel Films

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Nano Letters. 2011, 11(8), pp. 3355-3360. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/nl201736p
Zusammenfassung

We use time-resolved Faraday rotation spectroscopy to probe the electron spin dynamics in ZnO and magnetically doped Zn1-xCoxO sol-gel thin films. In undoped ZnO, we observe an anomalous temperature dependence of the ensemble spin dephasing time T2*, i.e., longer coherence times at higher temperatures, reaching T2* ∼ 1.2 ns at room temperature. Time-resolved transmission measurements suggest that this effect arises from hole trapping at grain surfaces. Deliberate addition of Co2+ to ZnO increases the effective electron Landé g factor, providing the first direct determination of the mean-field electron-Co2+ exchange energy in Zn1-xCoxO (N0alpha = +0.25 (0.02 eV). In Zn1-xCoxO, T2* also increases with increasing temperature,allowing spin precession to be observed even at room temperature.

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530 Physik
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ZnCoO, sol-gel, spin dynamics, hole trapping, exchange energy, time-resolved Faraday rotation
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ISO 690WHITAKER, Kelly M., Maxim RASKIN, Gillian KILIANI, Katja BEHA, Stefan T. OCHSENBEIN, Nils JANSSEN, Mikhail FONIN, Ulrich RÜDIGER, Alfred LEITENSTORFER, Daniel GAMELIN, Rudolf BRATSCHITSCH, 2011. Spin-on Spintronics : Ultrafast Electron Spin Dynamics in ZnO and Zn1-xCoxO Sol-Gel Films. In: Nano Letters. 2011, 11(8), pp. 3355-3360. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/nl201736p
BibTex
@article{Whitaker2011-08-10Spino-16869,
  year={2011},
  doi={10.1021/nl201736p},
  title={Spin-on Spintronics : Ultrafast Electron Spin Dynamics in ZnO and Zn1-xCoxO Sol-Gel Films},
  number={8},
  volume={11},
  issn={1530-6984},
  journal={Nano Letters},
  pages={3355--3360},
  author={Whitaker, Kelly M. and Raskin, Maxim and Kiliani, Gillian and Beha, Katja and Ochsenbein, Stefan T. and Janssen, Nils and Fonin, Mikhail and Rüdiger, Ulrich and Leitenstorfer, Alfred and Gamelin, Daniel and Bratschitsch, Rudolf}
}
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    <dcterms:abstract xml:lang="eng">We use time-resolved Faraday rotation spectroscopy to probe the electron spin dynamics in ZnO and magnetically doped Zn&lt;sub&gt;1-x&lt;/sub&gt;Co&lt;sub&gt;x&lt;/sub&gt;O sol-gel thin films. In undoped ZnO, we observe an anomalous temperature dependence of the ensemble spin dephasing time T2*, i.e., longer coherence times at higher temperatures, reaching T2* ∼ 1.2 ns at room temperature. Time-resolved transmission measurements suggest that this effect arises from hole trapping at grain surfaces. Deliberate addition of Co&lt;sup&gt;2+&lt;/sup&gt; to ZnO increases the effective electron Landé g factor, providing the first direct determination of the mean-field electron-Co&lt;sup&gt;2+&lt;/sup&gt; exchange energy in Zn&lt;sub&gt;1-x&lt;/sub&gt;Co&lt;sub&gt;x&lt;/sub&gt;O (N&lt;sub&gt;0&lt;/sub&gt;alpha = +0.25 (0.02 eV). In Zn&lt;sub&gt;1-x&lt;/sub&gt;Co&lt;sub&gt;x&lt;/sub&gt;O, T2* also increases with increasing temperature,allowing spin precession to be observed even at room temperature.</dcterms:abstract>
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