The polar Kerr rotation and ellipticity spectra of the as-deposited and annealed Zn1-xCoxO inhomogeneous magnetic semiconductors were measured. The Kerr rotation spectra versus the photon energy can be greatly modulated by adjusting the Co concentration or annealing the samples. Moreover, the observed maximal Kerr rotation, 0.72 degrees, in an annealed sample is higher than that of pure Co films, Pt/Co multilayers, and PtxCo1-x alloys. The enhanced Kerr rotation in the annealed samples can be explained by the fact that the annealed samples became a nanocomposite system consisting of Co clusters and Zn1-xCoxO magnetic semiconductor.
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