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Synthesis and room-temperature ferromagnetism of cobalt-doped SnO2 nanowires

Published online by Cambridge University Press:  31 January 2011

Jin Wu ,
Ke Yu ,
Yongsheng Zhang ,
Lijun Li  and
Ziqiang Zhu
Ke Yu*
Affiliation:
Key Lab for Polar Materials and Devices of Ministry of Education and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
Yongsheng Zhang
Affiliation:
Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang 471023, People's Republic of China
Ziqiang Zhu
Affiliation:
Key Lab for Polar Materials and Devices of Ministry of Education and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
*
a) Address all correspondence to this author. e-mail: yk5188@263.net
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Abstract

We have observed ferromagnetism in dilute cobalt-doped SnO2 nanowires at room temperatures. The Co-doped SnO2 nanowires with an average diameter of ∼50 nm were synthesized by the thermal chemical vapor transport method. High-resolution transmission electron microscopy and energy-dispersive x-ray spectroscopy analyses demonstrate that the nanowires are single-crystal structures and Co is homogeneously doped into the SnO2 lattice. The ferromagnetic hysteresis curves and temperature-dependent magnetization measurement provide evidence for ferromagnetic properties with a Curie temperature above room temperature. Oxygen annealing has been performed to study the roles played by the oxygen vacancies in determining the ferromagnetic properties of the nanowires.

Keywords

FerromagneticNanostructureOxide
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 6 , June 2009 , pp. 2001 - 2005
Copyright
Copyright © Materials Research Society 2009

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