抄録
Magnetic properties and magnetic domains of MnZn ferrite cores by low temperature sintering were investigated. The powder was prepared using the conventional ball milling. The specimens were sintered at 900°C for 5 hours in reductive atmosphere. Grain growth of sintered cores got remarkable by adding above 0.05 wt% meta-boric lithium (LiBO2). The initial permeability including 0.05wt%LiBO2 was 2071. Magnetic domains were investigated by Laser microscope and SEM using magnetic colloid. Width of magnetic domains were smaller than a commercial MnZn high permeability core (Material spec. is 15000 at 10kHz). It was suggested that this core has compressive stress by magnetic domain observation.
