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Extended solubility of CoO in ZnO and effects on magnetic properties

Published online by Cambridge University Press:  01 March 2006

Tobias A. Schaedler ,
Ashutosh S. Gandhi ,
Mitsuhiro Saito ,
Manfred Rühle ,
Richard Gambino  and
Carlos G. Levi
Tobias A. Schaedler*
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106-5050
Ashutosh S. Gandhi
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106-5050
Mitsuhiro Saito
Affiliation:
Max-Planck-Institut für Metallforschung, Stuttgart 70569, Germany
Manfred Rühle
Affiliation:
Max-Planck-Institut für Metallforschung, Stuttgart 70569, Germany
Richard Gambino
Affiliation:
Department of Materials Science and Engineering, State University of New York, Stony Brook, New York 11794-2275
Carlos G. Levi
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106-5050
*
a) Address all correspondence to this author. e-mail: tobias@engineering.ucsb.edu
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Abstract

The metastable solid solubility extension of CoO in ZnO (wurtzite) was investigated in precursor-derived powders as well as in thin films grown on sapphire substrates by pulsed laser deposition. A maximum solubility of 30% Co2+ in ZnO was achieved in the powders. Transmission electron microscopy (TEM) of the films revealed them to have grown epitaxially and retained up to nearly 40% CoO in solid solution, but some Co2+ precipitated as rock-salt. The temperature dependence of the metastable solubility limit in the ZnO–CoO system was assessed and is discussed in terms of the relevant thermodynamic factors. The magnetic properties of n-type conductive Zn0.79Co0.2Al0.01Ofilms were studied, yielding evidence of a ferromagnetic phase with a TC of 25 K and a second, magnetically ordered, phase with positive exchange and arguably a TC of ∼250 K. Connections between the properties and microstructural observations in high resolution TEM are proposed.

Keywords

Laser ablationMagnetic propertiesMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 3 , March 2006 , pp. 791 - 801
Copyright
Copyright © Materials Research Society 2006

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