| 摘要 |
An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic powder comprising discharging a melt of a starting material mixture comprising a glass-forming component and a hexagonal ferrite-forming component through an outlet provided in the bottom surface of the melting vat and supplying it between a pair of rotating milling rolls positioned beneath the melting vat; discharging an amorphous material from between the rolls by roll quenching the melt that has been supplied between the milling rolls, wherein at least an outermost layer portion of the milling rolls is comprised of a material with a Young's modulus of 500 GPa or higher and a Rockwell hardness of 85.0 HRA or higher, and the outermost layer portion has a thickness of 5 mm or greater and a surface roughness of 0.5μm or less.
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