Abstract
Bi-substituted YIG (Bi 1.8 Y 1.2 Fe 5 O 12 ) nanoparticles were prepared by ultrasonic irradiation-assisted coprecipitation and annealing processes. The nanoparticles were dispersed in a plastic epoxy binder with a dispersing agent to induce polymerization by the solidifying agent. The magnetic and magneto-optical properties of the nanoparticles and the Bi-YIG/epoxy hybrid materials were investigated. The particles heat treated at 650 °C show a spherical shape and its size is smaller than 20 nm. The saturation magnetization of the Bi-YIG nanoparticles is 17 emu/g. As the particle content in the hybrid materials increases from 0.01 to 0.20 wt%, both the Faraday rotation (θ F ) and the Verdet constant of the hybrid materials at the wavelength 525 nm increase from 2.4 to 52.8 deg/cm, and from 0.02 × 10 -2 to 2.63 × 10 -2 deg/Oe cm, respectively.
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