Metallic magnetic powder

特許 権利維持 The present invention provides a process for producing a metallic magnetic powder for magnetic recording, comprising, in sequence, the step of allowing a reducing agent to act on a metallic magnetic powder comprising particles having a metallic magnetic phase composed mainly of Fe or Fe and Co and containing one or more of rare earth elements (including Y), Al and Si (these elements being hereinafter referred to as ''nonmagnetic components') in a liquid containing a complexing agent which can form a complex with at least one of the nonmagnetic components to elute the nonmagnetic components in the powder particles into the liquid (an elution treatment step).