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

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

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WHITAKER, 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. 11(8), pp. 3355-3360. ISSN 1530-6984. eISSN 1530-6992

@article{Whitaker2011-08-10Spin--16869, title={Spin-on Spintronics : Ultrafast Electron Spin Dynamics in ZnO and Zn1-xCoxO Sol-Gel Films}, year={2011}, doi={10.1021/nl201736p}, 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} }

Whitaker, Kelly M. Raskin, Maxim deposit-license Ochsenbein, Stefan T. Rüdiger, Ulrich Spin-on Spintronics : Ultrafast Electron Spin Dynamics in ZnO and Zn1-xCoxO Sol-Gel Films Rüdiger, Ulrich eng 2011-08-10 We use time-resolved Faraday rotation spectroscopy to probe the electron spin dynamics in ZnO and magnetically doped Zn<sub>1-x</sub>Co<sub>x</sub>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<sup>2+</sup> to ZnO increases the effective electron Landé g factor, providing the first direct determination of the mean-field electron-Co<sup>2+</sup> exchange energy in Zn<sub>1-x</sub>Co<sub>x</sub>O (N<sub>0</sub>alpha = +0.25 (0.02 eV). In Zn<sub>1-x</sub>Co<sub>x</sub>O, T2* also increases with increasing temperature,allowing spin precession to be observed even at room temperature. Leitenstorfer, Alfred Bratschitsch, Rudolf Janssen, Nils First publ. in: Nano Letters ; 11 (2011), 8. - S. 3355–3360 Leitenstorfer, Alfred Ochsenbein, Stefan T. Raskin, Maxim Beha, Katja Bratschitsch, Rudolf 2011-11-18T08:41:04Z Gamelin, Daniel Janssen, Nils Fonin, Mikhail 2012-07-11T22:25:05Z Beha, Katja Whitaker, Kelly M. Kiliani, Gillian Kiliani, Gillian Fonin, Mikhail Gamelin, Daniel

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