Effect of YIG nanoparticles addition on the magnetic properties of manganese ferrite

In this work, manganese ferrites with YIG nanoparticles added were developed for MHz frequency applications. The effect of YIG additive on the power loss, initial permeability and cut-off frequency of Mn ferrites was investigated. A small quantity of added YIG effectively reduces the power loss and concurrently increases the initial permeability. Compared to the results for the Mn ferrite with no YIG addition, the optimal Mn ferrite with 600 ppm added YIG exhibits a reduction in the power loss at 25 °C of 56.4% and 36.6% at 1 MHz/50 mT and 3 MHz/10 mT, respectively, and a 13.9% increase in the initial permeability. This sample also exhibits a good stability of the power loss against temperature. The power loss remains below 205 kW/m
³
over temperatures ranging from 25 to 140 °C. The effect mechanism of YIG addition on the magnetic properties of Mn ferrites was studied. An analysis based on the equivalent circuit model showed that the reduction in the eddy current loss and power loss mainly results from the increase in the grain boundary resistance caused by the addition of highly resistive YIG.