Abstract
The effective mass approximation is applied to explain the abnormal magnetic behaviourobserved recently in Mn-doped ZnO nanowires. The magnetization versus temperature curveshave been calculated for nanowires at different radii and carrier densities. Abnormal peaks in theM–T curves are observed at low temperature when the radii of the cylindersare in the nanometre region. Peaks have been observed in the calculatedM–T curves for some carrier densities where the Fermi levels are near the peaks of the majority spinsin the density of states (DOS) plots, and the peak position moves to the high-temperatureregion when the radius of the nanowire decreases. The abnormal magnetic peaks in theM–T curve can be explained as a quantum confinement effect of nanowires.
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