Magneto-optical Kerr effect and optical properties of amorphous Co1−xSix (0.59⩽×⩽0.77) alloy films

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Abstract
The Kerr spectra and optical constants of amorphous Co 1−x Si x (0.59⩽×⩽0.77) alloy films were measured in the spectral range 1.6–3.5 eV. It was found that there is rather considerable Kerr rotation near the high-energy side of 3.5 eV for the films (0.67⩽×⩽0.75), and there is a maximum value of −0.35°, which is comparable with that of pure Co, at x=0.75. The considerable Kerr rotation was ascribed to the following two causes: (i) the finite, but nonzero, nondiagonal element of dielectric function; (ii) the large optical constanteffect due to the appropriate diagonal element of dielectric function. These changes of dielectric function originated from the metal-to-semiconductor transition controlled by Si concentration. There may be potential magneto-optical application in blue light range for such kinds of material.