Time-resolved optical techniques are used to explore electron spin dynamics in bulk and epilayer samples of n-type ZnO as a function of temperature and magnetic field. The bulk sample yields a spin coherence time T2* of 20 ns at T=30K. Epilayer samples, grown by pulsed laser deposition, show a maximum T2* of 2 ns at T=10K, with spin precession persisting up to T=280K.
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