Voigt Effect in Magnetic Films

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Abstract
The sizes of magneto‐optical signals have been investigated theoretically for the case of transmission at normal incidence through a thin magnetic film and periodic hard‐axis magnetization reversal in the plane of the film. The magneto‐optical effect in this arrangement, termed Voigt effect, is of second order; it depends on the square of the basic magneto‐optical constant Q and on the square of the magnetization. Consequently, in the permittivitytensor describing the macroscopic optical and magneto‐optical properties of the material, it is necessary to take into account not only the off‐diagonal elements but also the terms in Q 2 in the diagonal elements which are justifiably ignored in evaluations of first‐order effects. The presence of the film boundaries is also considered. The theory is used to reconcile published measurements of the Voigt effect in films of cobalt and iron in the near infrared with magneto‐optical parameters obtained by Krinchik [J. Appl. Phys. 35, 2 (1964)] from measurements of first‐order effects. A recent experiment carried out to test the theory further is also described.

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