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Title: Magnetoresistance of Co-doped ZnO thin films
Sponsor: Science Foundation Ireland
Author's Homepage:
Keywords: Physics
Issue Date: 2006
Publisher: American Institute of Physics
Citation: 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
Series/Report no.: Journal of Applied Physics
Abstract: 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.
Description: PUBLISHED
Appears in Collections:Physics (Scholarly Publications)

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