Abstract
The spectrum of elementary excitations of a ferroelectric in a magnetic field H parallel and perpendicular to a spontaneous polarization P was calculated. In the case H∥P high-frequency susceptibility and interaction of electron excitations with electromagnetic waves were analyzed. It was shown that magnetic field induces a high-frequency magnetoelectric (ME) susceptibility and ME gyration in reflected and transmitted light. ME gyration means the rotation of polarization plane of light at an angle proportional to the product (PH). For the transmitted light the angle of ME gyration in the case H⊥n (n is a normal to the' surface) depends periodically on the path travelled; and does not depend on the path if H∥n. ME gyration, in contrast to Faraday effect, is compensated at the double (forth and back) travel of light. Indicated ME effects are possible not only in ferroelectrics but also in a dielectric at the presence of constant electric and magnetic fields.
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