FERRITE MAGNETIC POWDER FOR MAGNETIC CARD

摘要

PROBLEM TO BE SOLVED: To realize high-density recording and to improve overwrite characteristics of a magnetic card. SOLUTION: The ferrite magnetic powder shows such properties that the probability of particles having the particle size in the range of D±D/2 (μm) is >=50%, wherein D is the average particle size (μm), and that the particles show <=2 SFD32 (switching field distribution) and <=4 SFD128.