Patent ID: 6627313
Filing Date: 2003-09-30
Classification: B82Y,C01P,G11B,Y10S,Y10T

Abstract:
Spindle-shaped magnetic metal particles containing iron as a main component, having an average major axis diameter (L) of 0.05 to 0.15 &mgr;m; an aspect ratio of 4:1 to 7.2:1; a coercive force of 111.4 to 142.2 kA/m; a Co content of from 0.5 to less than 5 atm % based on whole Fe; a crystallite size of from 150 to less than 170 Ã¥; a ratio of Al to Co from 1.1:1 to less than 2.0:1; a specific surface area (S) represented by the formula:S&lE;âˆ’160Ã—L+65; an oxidation stability (&Dgr;&sgr;s) of saturation magnetization of not more than 5.0%; and an ignition temperature of not less than 140Â° C.