The dielectric and magnetic properties of manganese oxide-coated Fe 3 O3 nanoparticles (NPs) were measured by the cavity perturbation method at x-band microwave frequencies ranging from 7-12.5 GHz with controlled external magnetic field up to 2.2 kOe at room temperature. Different ratios (5%, 10%, and 20% by weight) of coated NPs were prepared by sol-gel method then mixed with carbonyl iron powder in epoxy matrix. The saturation magnetization is inversely proportional to the NPs ratio in the mixture between 150 and 180 emu/g. The real part of the permittivity decreased with increasing NPs concentration, but the permittivity change by magnetic field increased. The tunability behavior is explained by insulator-ferromagnetic interface magnetoelectricity and the large surface volume ratio for the NPs.
ASJC Scopus subject areas
- Physics and Astronomy(all)
Ahad, F. B. A., Lee, S. F., Hung, D. S., Yao, Y. D., Yang, R. B., Lin, C. K., & Tsay, C. Y. (2010). Magnetoelectric behavior of carbonyl iron mixed Mn oxide-coated ferrite nanoparticles. Journal of Applied Physics, 107(9), [09D904]. https://doi.org/10.1063/1.3360357