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Extended solubility of CoO in ZnO and effects on magnetic properties

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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.

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Authors and Affiliations

  1. Materials Department, University of California, Santa Barbara, California, 93106-5050, USA

    Tobias A. Schaedler, Ashutosh S. Gandhi & Carlos G. Levi

  2. Max-Planck-Institut für Metallforschung, Stuttgart, 70569, Germany

    Mitsuhiro Saito & Manfred Rühle

  3. Department of Materials Science and Engineering, State University of New York, Stony Brook, New York, 11794-2275, USA

    Richard Gambino

Authors
  1. Tobias A. Schaedler
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  2. Ashutosh S. Gandhi
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  3. Mitsuhiro Saito
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  5. Richard Gambino
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  6. Carlos G. Levi
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Correspondence to Tobias A. Schaedler.

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Schaedler, T.A., Gandhi, A.S., Saito, M. et al. Extended solubility of CoO in ZnO and effects on magnetic properties. Journal of Materials Research 21, 791–801 (2006). https://doi.org/10.1557/jmr.2006.0092

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  • DOI: https://doi.org/10.1557/jmr.2006.0092

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