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Abstract
We show in transfer-matrix calculations of electromagnetic transmission through a ferromagnetic metal layer embedded in one-dimensional photonic crystals that electromagnetic losses can be greatly suppressed and nonreciprocal response significantly enhanced, when placing the layer at the node of the localized mode produced at the defect in the periodic structure. Nonreciprocal circular dichroism and Faraday rotation are observed at the ferromagnetic resonance and far from the resonance, respectively, and can be controlled with magnetic field.