Metallic magnetic powder, process for producing same, magnetic coating composition, and magnetic

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To provide a metal magnetic powder composed of metal magnetic particles having reduced particle volume, in which affinity with an organic material such as resin is improved when being mixed into such an organic material, and dispersibility of the metal magnetic particle into the organic material such as resin is improved, and a method for producing the same, and a coating and a magnetic recording medium using the metal magnetic powder, wherein the method is provided for producing a metal magnetic powder having a metal magnetic phase mainly composed of ferromagnectic elements, and composed of particles containing one or more kinds of elements selected from rare earth elements including Y, and Al, Si as non-magnetic components, comprising the step of : eluting the non-magnetic components in the particles under an action of a reducing agent acting on the metal magnetic powder, in a solution containing a complexing agent capable of forming the non-magnetic components and a complex; and forming an oxide layer on the particles in the solution after eluting the non-magnetic components into the solution, without drying the particles.