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Optical Faraday rotation has been measured as a function of the frequency of an applied magnetic field in two compositions of the dilute magnetic semiconductor CdMnTe. A roll-off in response is observed with the roll-off frequency increasing with Mn concentration. The frequency dependence is fit well by a simple Debye relaxation model. This dependence is attributed to relaxation of the magnetization through interactions between the Zeeman and spin-spin energy reservoirs.
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Butler et al. (1986) studied this question.
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