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An instrument is described which allows automatic recording of the temperature or magnetic-field dependence of both the magneto-optic Faraday rotation and the ellipticity angle of circular dichroism of magnetic samples. The instrument includes a Wollaston analyzer prism, two light detectors, and an operational amplifier circuit containing an electronic divider for eliminating the influence of light intensity variations. Changes of 10″ in the Faraday rotation angle and of 1′ in the angle of circular dichroism are detectable with our equipment.
Harms et al. (1973) studied this question.