Giant Faraday effect of FeCo-BaF and FeCo-SiN nanogranular films

摘要

We introduce FeCo-BaF and FeCo-SiN nanogranular films exhibiting giant Faraday effect. These films have a nanocomposite structure, in which nanometer-sized FeCo ferromagnetic granules are dispersed in BaF_2 or Si_3N_4 matrix. FeCo-BaF film has a good figure of merit of Faraday effect from the crystalized BaF_2 matrix. FeCo-SiN film has a large refraction index from the nature of Si_3N_4 matrix. These properties contribute to the practical application of nanogranular films to optical devices.