Magneto-optical material and method for producing same

A magneto-optical material, comprising a nanogranular structure in which nanoparticles are dispersed in a matrix, wherein

• the matrix is a fluoride matrix including at least one element selected from the group consisting of Li, Be, Mg, Al, Si, Ca, Sr, Ba, Bi, and rare earth elements, and
• the nanoparticles are magnetic nanoparticles having at least one magnetization selected from the group consisting of a Fe—Pt alloy, a Co—Pt alloy, a Fe—Co—Ni—Al alloy, a Co ferrite, and a Ba ferrite, and including a Fe—Pt ordered phase, a Co3—Pt ordered phase, or a spinel phase,
• a light transmittance for incident light in a wavelength band of 400 nm to 2000 nm is within a range of 1 [%/μm] or more, and
• an absolute value of Faraday rotation angle accompanied by residual magnetization is 0.2 [deg./μm] or more for light in at least a part of a wavelength band of 600 nm to 1600 nm in a state of no magnetic field applied.