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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

Type of Publication: Journal article
URI (citable link): http://nbn-resolving.de/urn:nbn:de:bsz:352-168690
Author: Whitaker, Kelly M.; Raskin, Maxim; Kiliani, Gillian; Beha, Katja; Ochsenbein, Stefan T.; Janssen, Nils; Fonin, Mikhail; Rüdiger, Ulrich; Leitenstorfer, Alfred; Gamelin, Daniel; Bratschitsch, Rudolf
Year of publication: 2011
Published in: Nano Letters ; 11 (2011), 8. - pp. 3355-3360. - ISSN 1530-6984. - eISSN 1530-6992
Pubmed ID: 21749121
DOI (citable link): https://dx.doi.org/10.1021/nl201736p
Summary:
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.
Subject (DDC): 530 Physics
Keywords: ZnCoO, sol-gel, spin dynamics, hole trapping, exchange energy, time-resolved Faraday rotation
Link to License: In Copyright
Bibliography of Konstanz: Yes

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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. Available under: doi: 10.1021/nl201736p

@article{Whitaker2011-08-10Spino-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 Ochsenbein, Stefan T. Rüdiger, Ulrich Spin-on Spintronics : Ultrafast Electron Spin Dynamics in ZnO and Zn1-xCoxO Sol-Gel Films Rüdiger, Ulrich eng terms-of-use 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 Beha, Katja Ochsenbein, Stefan T. Leitenstorfer, Alfred Raskin, Maxim First publ. in: Nano Letters ; 11 (2011), 8. - S. 3355–3360 Bratschitsch, Rudolf Fonin, Mikhail Janssen, Nils 2011-11-18T08:41:04Z Gamelin, Daniel 2012-07-11T22:25:05Z Beha, Katja Fonin, Mikhail Whitaker, Kelly M. Kiliani, Gillian Kiliani, Gillian Gamelin, Daniel

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