Perovskite-type SrTiO3 doping for low-loss MnZn ferrites with good frequency and temperature stability

The rapid advancement of high-frequency, miniaturized, and high-efficiency electronic technologies has imposed stringent requirements on magnetic materials, particularly concerning performance stability for frequency and temperature. In this study, strontium titanate SrTiO ₃ (STO), a dielectric material, was introduced as a dopant into MnZn ferrites to reduce power loss ( P _cv ) under high-frequency and wide-temperature conditions. Experimental results demonstrate that STO doping significantly reduces P _cv at 1 MHz and 30 mT, with the 300 ppm STO-doped samples achieving an exceptionally low P _cv of 184 mW/cm ³ at room temperature (20 ℃). This improvement is attributed to microstructural refinement and enhanced resistivity, which suppress eddy current loss while maintaining low hysteresis loss. Furthermore, the STO-doped MnZn ferrites exhibit excellent wide-temperature stability, maintaining P _cv below 225 mW/cm ³ across the range of -20 ℃ to 100 ℃. These findings indicate that STO doping provides a cost-effective and practical approach to high-frequency and wide-temperature performance for MnZn ferrites, offering both scientific insight and industrial potential for mass production of low-loss magnetic cores.