Abstract: An object of the present invention is to provide a magneto-optical material capable of exhibiting the Faraday effect even though no magnetic field is applied. The magneto-optical material of the present invention has a nanogranular structure in which magnetic nanoparticles are dispersed in a fluoride matrix, and can exhibit Faraday properties without requiring the application of a magnetic field because the magnetic nanoparticles are configured by a magnetic material that has residual magnetization and consists of any of a Fe—Pt alloy, a Co—Pt alloy, a Fe—Co—Ni—Al alloy, a Co ferrite, or a Ba ferrite.

Abstract: An object of the present invention is to provide a new nanogranular structure material having magneto-optical properties different from those of existing nanogranular structure materials, and a method for producing the same. The nanogranular structure material has a composition represented by L-M-F—O wherein L is at least one element selected from the group consisting of Fe, Co, and Ni, and M is at least one element selected from the group consisting of Li, Be, Mg, Al, Si, Ca, Sr, Ba, Bi, and rare earth elements, F is fluorine, and O is oxygen. The nanogranular structure material according to the present invention is composed of a matrix formed of a fluorine compound having a composition represented by M-F and metal oxide nanoparticles dispersed in the matrix and having a composition represented by L-O.

Abstract: A nanogranular thin film consisting of nonmagnetic matrix and ferromagnetic fine particles in nano scale is improved to enhance the thermal stability and the S/N ratio. The ferromagnetic fine particles consist of (FeaCo1-a)1-xPtx, (0.3≦x≦0.7, 0.1≦a≦1), (FeaCo1-a)1-xPdx, (0.3≦x≦0.7, 0.1≦a≦1) or (FeaCo1-a) 1-x(PtbPd1-b)x, (0.3≦x≦0.7, 0.1≦a≦1, and 0<b<1).

Abstract: A nanogranular thin film consisting of nonmagnetic matrix and ferromagnetic fine particles in nano scale is improved to enhance the thermal stability and the S/N ratio. The ferromagnetic fine particles consist of (FeaCo1-a)1-xPtx, (0.3≦x≦0.7, 0.1≦x≦1), (FeaCo1-a)1-xPdx, (0.3≦x≦0.7, 0.1≦x≦1) or (FeaCo1-a)1-x(PtbPd1-b)x, (0.3≦x≦0.7, 0.1≦x≦1, and 0<b<1).