The anisotropic properties in the magnetization and the magneto-optics of Zn1-xCoxO were investigated. Magnetization and the magnetic circular dichroism (MCD) measurements were performed on Zn1-xCoxO films (x ≤ 0.15) with different growth orientations of the c- and the a-axes, which were grown on c- and r-surface sapphire substrates, respectively, by using pulsed laser deposition. In the magnetization measurements, only paramagnetic behaviors were observed down to 2 K, both in the c- and the a-plane films. In the magnetization and the MCD measurements on c- and a-plane films, the magnitudes of the magnetizations and the MCD intensities of the peak due to the d-d transition of Co2+ ions were found to exhibited similar anisotropic properties; those under magnetic fields along the a-axis of the wurtizte crystal were always larger than those under fields along the c-axis. These observations indicate that the paramagnetic behaviors observed both in the magnetization and the MCD are due to the intrinsic nature of the pure diluted phase of Zn1-xCoxO.
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