アモルファスGdCo薄膜の磁気光学スペクトル

概要

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Spectral dependences of polar magneto-optical effect-Kerr rotation and reflectance magneto-circular dichroism (RMCD) -of rf-sputtered Gd-Co films have been studied. The Kerr rotation angle increases slightly toward longer wavelength with a hump around 11.2 μm. This result favors the use of semiconductor lasers for optical reading-out of recorded signals on the Gd-Co disk. In the RMCD spectra a sign reversal is observed at certain wavelength between 0.6 and 1.1 μm, which depends strongly on the bias voltage applied during film preparation. Influence on the RMCD spectrum of oxygen introduced during bias-sputtering has also been studied.
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