Spin-on spintronics: ultrafast electron spin dynamics in ZnO and Zn₁-xCoxO sol-gel films.

@article{Whitaker2011SpinonSU,
  title={Spin-on spintronics: ultrafast electron spin dynamics in ZnO and Zn₁-xCoxO sol-gel films.},
  author={Kelly M Whitaker and Maxim Raskin and Gillian Alexandra Kiliani and Katja Beha and Stefan T. Ochsenbein and Nils Janssen and Mikhail Fonin and Ulrich R{\"u}diger and Alfred Leitenstorfer and Daniel R Gamelin and Rudolf Bratschitsch},
  journal={Nano letters},
  year={2011},
  volume={11 8},
  pages={3355-60}
}
We use time-resolved Faraday rotation spectroscopy to probe the electron spin dynamics in ZnO and magnetically doped Zn(1-x)Co(x)O sol-gel thin films. In undoped ZnO, we observe an anomalous temperature dependence of the ensemble spin dephasing time T(2), i.e., longer coherence times at higher temperatures, reaching T(2) ∼ 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(2+) to ZnO… CONTINUE READING