Magnetic, and Dielectric Properties of Cobalt and Zirconium Co-Doped Iron Oxide Nanoparticles via Hydrothermal Synthesis Approach

Magnetic metal oxide nanoparticles play a significant role due to their extensive applications ranging from fundamental research to industrial use. This work presents magnetic, and dielectric properties of (Co, Zr) co-doped iron oxide nanoparticles synthesized by hydrothermal method. The synthesis temperature was 150°C, and time varied as 4, 6, 8, 10, and 12 hours for five samples. Co-doping of cobalt and zirconium significantly affects the achievement of a particular magnetic phase of iron oxide. The frequency-dependent dielectric and impedance studies are presented using an impedance analyzer at room temperature in a wide frequency range. The typical dispersion behavior of characteristic dielectric parameters was investigated using Maxwell-Wagner's model and Koop's theory. The dielectric constant value is maximum (~58 at log f ~1.5) for the sample synthesized using the hydrothermal method under 8 hours reaction time. Magnetic properties are examined using a Vibrating Sample Magnetometer (VSM Lakeshore 7404). Ferromagnetic MH loops were observed with a maximum value of magnetic saturation (~45emu/g) for the sample synthesized using 8 hours of reaction time.