High performance NiZn ferrite

Abstract

High-performance NiZn ferrite was developed for use in mini DC-DC converters and inductors. In the development process, attention was focused on a small amount of MnO/sub 2/ contained in NiZn ferrite. The quantity of MnO/sub 2/ was examined as to its effects on the crystal structure and magnetic properties of NiZn ferrite cores. It was confirmed that core loss can be reduced by optimizing the MnO/sub 2/ content. This was attributed to the decrease of lattice strain in the crystal structure of the core by a change in MnO/sub 2/ content, which causes a chain reaction of a coercive force decline and then a hysteresis loss decline. As a result, we were able to develop a top class low-loss NiZn ferrite.