The magneto-electric phenomena (electromagneto-optical effect) for yttrium iron garnets/lead zirconate titanate structure by applying an external variable electrical field was investigated by using optical polarimetry method. Electromagneto-optical effect for the specified structure in longitudinal and transverse geometries was carried out as a function of the variable low-frequency electric field and static magnetic field. This effect for composite structure went up essentially than electromagneto-optical effect for separate ferrimagnetic (yttrium iron garnets) phase.