Temperature dependence of magnetic behaviour in very fine grained, spark plasma sintered NiCuZn ferrites

Recently, using spark plasma sintering technique, a family of very fine grained, fully dense NiCuZn ferrites have been produced, which show constant permeability up to several 10 MHz. These ferrites can be used for filtering purposes in high frequency applications where a wide frequency band is required. In this paper, we study the magnetization processes taking place in these nano grained materials, in the frequency interval of 100 kHz to 5 MHz. Using a fluxmetric hysteresis graph, permeability, loss, and BH loops are measured at different temperatures, from −5 °C to 110 °C. Results are compared to the behavior of micrometric grain size ferrites, which are commonly used for power electronic and high frequency applications.