Hexagonal strontium ferrite magnetic powder and method of manufacturing the same, and magnetic recording medium and method of manufacturing the same

Abstract

An aspect of the present invention relates to a method of manufacturing hexagonal strontium ferrite magnetic powder, which comprises melting a starting material mixture which has a composition, as a composition converted into an oxide, lying within a region enclosed by the following four points: (a) SrO=48.0 mol %, Fe2O3=17.2 mol %, B2O3=34.8 mol %; (b) SrO=55.9 mol %, Fe2O3=17.7 mol %, B2O3=26.4 mol %; (c) SrO=41.7 mol %, Fe2O3=40.9 mol %, B2O3=17.4 mol %; (d) SrO=36.7 mol %, Fe2O3=40.1 mol %, B2O3=23.2 mol %; in a ternary diagram with SrO, Fe2O3, which may include an Fe substitution element, and B2O3 as apexes, to provide a melt, and quenching the melt to obtain a solidified product; and heat treating the solidified product to precipitate hexagonal strontium ferrite magnetic particles within the solidified product.

Dependencies are inferred from the claim text.