Abstract
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.
