Acicular alloy magnetic powder, production of the same and magnetic recording medium comprising the same.

摘要

An acicular alloy base magnetic powder comprising iron and cobalt, which has a major particle size of not larger than 0.25 mu m, an axial ratio of from 4 to 8, a cobalt content of from 8 to 50 % by weight based on the weight of iron and saturation magnetization of at least 120 emu/g after being kept standing at the temperature of 60 DEG C and relative humidity of 90 % for a week, which has improved corrosion resistance and can provide a magnetic recording medium suitable for recording in the short wavelength range.