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Issue 5, 2005
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Absence of ferromagnetism in Mn- and Co-doped ZnO

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Following the theoretical predictions of ferromagnetism in Mn- and Co-doped ZnO, several workers reported ferromagnetism in thin films as well as in bulk samples of these materials. While some observe room-temperature ferromagnetism, others find magnetization at low temperatures. Some of the reports, however, cast considerable doubt on the magnetism of Mn- and Co-doped ZnO. In order to conclusively establish the properties of Mn- and Co-doped ZnO, samples with 6% and 2% dopant concentrations have been prepared by the low-temperature decomposition of acetate solid solutions. The samples have been characterized by X-ray diffraction, EDAX and spectroscopic methods to ensure that the dopants are substitutional. All the Mn- and Co-doped ZnO samples (prepared at 400 °C and 500 °C) fail to show ferromagnetism. Instead, their magnetic properties are best described by a Curie–Weiss type behavior. It appears unlikely that these materials would be useful for spintronics, unless additional carriers are introduced by some means.

Graphical abstract: Absence of ferromagnetism in Mn- and Co-doped ZnO

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Publication details

The article was received on 28 Jul 2004, accepted on 28 Sep 2004 and first published on 19 Nov 2004

Article type: Paper
DOI: 10.1039/B412993H
Citation: J. Mater. Chem., 2005,15, 573-578
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    Absence of ferromagnetism in Mn- and Co-doped ZnO

    C. N. R. Rao and F. L. Deepak, J. Mater. Chem., 2005, 15, 573
    DOI: 10.1039/B412993H

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