HEXAGONAL FERRITE PARTICLE POWDER FOR MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide hexagonal ferrite particle powders highly dispersible in magnetic paint and capable of reducing noise of the magnetic recording medium more.SOLUTION: The hexagonal ferrite particle powders for a magnetic medium is prepared in a manner that an average plate surface diameter (L) among hexagonal ferrite particle powders is 10 to 20.5 nm, and a relationship between the average plate surface diameter (L) and a BET specific surface area value (SSA) is represented by following expression: (1) SSA(m/g)≥-2.3×L(nm)+127.