Patent ID: 6599608
Filing Date: 2003-07-29
Classification: G11B,H01F,Y10S,Y10T

Abstract:
A magnetic recording media, comprising:a substrate selected from a group consisting of a card, a tape, or a disk; and a magnetic layer positioned on the substrate, the magnetic layer comprising substantially spherical magneto-plumbite ferrite particles having a coercivity of at least about 1000 Oe, a size in the range of about 0.05 to about 1.2 &mgr;m, and an aspect ratio less than about 2:1, wherein the substantially spherical magneto-plumbite ferrite particles have a composition corresponding to AOÂ·n(Fe2âˆ’xMxO3), wherein A is at least one of barium and strontium, n is a molar (Fe2âˆ’xMxO3)/AO ratio in the range of about 5 to about 6, M is more than one substitution element selected from the group of Co, Zn, Ni, Al, Ti, Sn, Si, Nb, and Ta, and x is in a range of 0 to about 3.5.