Metal magnetic powder and process for producing the same, magnetic coating material, and magnetic recording medium

A metal magnetic powder comprising particles having a metal magnetic phase mainly composed of ferromagnetic elements, containing one or more kinds of elements selected from a group consisting of rare earth elements including Y, Al, and Si, and having an oxide layer, wherein

• an isoprotic point is 7.0 or more;
• an average long axial length of a particle is 10 to 50 nm;
• an average particle volume of the particle including an oxide layer is 5000 nm3 or less;
• and
• a value of (R+Al+Si)/(Fe+Co) atomic ratio calculated using a value of a content (atom %) of each element contained in the particle is 20% or less,
• wherein
• R is a rare earth element containing Y, and a content of one kind or two kinds selected from the group consisting of R, Al, and Si, is 0 in some cases, and
• an adsorption amount of stearic acid per unit area, absorbed on the particles is 1.2 mg/m2 or more.