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Following the theoretical predictions of ferromagnetism in Mn- and Co-dopedZnO, several workers reported ferromagnetism in thin films as well as in bulksamples 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 toconclusively establish the properties of Mn- and Co-doped ZnO, samples with 6percent and 2 percent dopant concentrations, have been prepared by thelow-temperature decomposition of acetate solid solutions. The samples have beencharacterized by x-ray diffraction, EDAX and spectroscopic methods to ensurethat the dopants are substitutional. All the Mn- and Co-doped ZnO samples(prepared at 400 deg C and 500 deg C) fail to show ferromagnetism. Instead,their magnetic properties are best described by a Curie-Weiss type behavior. Itappears unlikely that these materials would be useful for spintronics, unlessadditional carriers are introduced by some means.

Absence of ferromagnetism in Mn- and Co-doped ZnO