P. Stamenov P, M. Venkatesan, LS.Dorneles, D. Maude, JMD Coey 'Magnetoresistance of Co-doped ZnO thin films' in Journal of Applied Physics, 99, (8), 2006, 08M124
Journal of Applied Physics 99 8
Longitudinal, transverse, and perpendicular magnetoresistances were investigated at temperatures
1.2 T 300 K in fields of up to 20 T for four ZnO films: one undoped, two with 4% Co one
paramagnetic, the other exhibiting anhysteretic ferromagnetism at room temperature , and one with
25% Co which exhibits hysteretic ferromagnetism, butterfly magnetoresistance, and presence of Co
clusters. The magnetoresistance becomes negligibly small above 50���100 K, and magnetic terms are
only evident below 20 K, where the mobility is sufficiently high. Quantum oscillations observed
below 2 K in the paramagnetic sample with 4% Co give two different extremal Fermi surface cross
sections. The data for dilute ferromagnetic samples are consistent with coherent spin transport in a
ferromagnetic matrix; data for the x=25% films suggest that spin-polarized electrons can tunnel
coherently between well-separated cobalt clusters.
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