ACICULAR FERROMAGNETIC ALLOY PARTICLES FOR USE IN MAGNETIC RECORDING MEDIA

摘要

Acicular ferromagnetic alloy particles doped with silicon, chromium and nickel and optionally magnesium and a process for producing said particles comprising heating at 300 DEG to 500 DEG C. under reducing atmosphere acicular particles of alpha -iron(III) oxide hydroxide doped with silicon, chromium and nickel and optionally magnesium or acicular particles of alpha -ferric oxide doped with silicon, chromium and nickel and optionally magnesium obtained by dehydrating the acicular particles of alpha -iron(III) oxide hydroxide doped with silicon, chromium and nickel and optionally magnesium are disclosed herein.