High permeability-high frequency stable MnZn ferrites

► Optimization of sintering is described for achieving high initial permeability. ► Optimization of sintering is described for receiving frequency stability. ► For high permeability, high densities and large grain sizes are required. ► The achieved initial permeability is higher than 12,500. ► The losses, tan(δ)/μi, are 3.1×10−6 at 10 kHz and 20.5×10−6 at 100 kHz.