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Room-temperature Ferromagnetism in Nanostructured Co-doped ZnO

Published online by Cambridge University Press:  01 February 2011

M. Wei ,
N. Khare ,
K. A. Yates ,
D. Zhi  and
J. L. MacManus-Driscoll
M. Wei
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
N. Khare
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
K. A. Yates
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
D. Zhi
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
J. L. MacManus-Driscoll
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
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Abstract

Nanosized Co-doped ZnO samples were synthesized using an ultrasonic spray assisted chemical vapour deposition method. Microstructural and magnetic properties of these samples were studied. The room-temperature ferromagnetism was observed in the Co-doped ZnO. Also, x-ray analysis revealed a wurtzite ZnO structure with a small change of the lattice constants due to the doping of Co in ZnO. Raman spectroscopy of the Co-doped ZnO films indicated direct substitution of Co. Scanning electron microscopy showed nanostructured Co-doped ZnO with a ring or cup shape. Transmission electron microscopy analysis revealed nano grains within the rings of an average diameter of around 10 nm. Both energy dispersive spectroscopy and energy-filtered transmission electron microscopy indicated a uniform distribution of Co.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 877: Symposium S – Magnetic Nanoparticles and Nanowires , 2005 , S3.8
Copyright
Copyright © Materials Research Society 2005

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