| 摘要 |
PROBLEM TO BE SOLVED: To produce a CoPt sputtering target capable of obtaining a magnetic recording medium having a recording layer uniform in film characteristics and excellent in recording and reproducing characteristics, to provide a method for producing the same, to produce a magnetic recording film and to produce a CoPt magnetic recording medium. SOLUTION: This CoPt sputtering target is composed of a target material essentially consisting of Co, mainly consisting of Pt and contg. at least one or more kinds among elements selected from the group 4a elements, 5a elements, 6a elements, B and C, in which, in the target structure, the maximum inscribed circle diameter of the phase substantially composed of Pt single substance is substantially controlled to <=500μm, and the layer thickness of a diffusion layer lying on the boundary of the Pt phases is substantially controlled to <=50μm. By this target, a magnetic recording film used for a hard disk, or the like, having a uniform Pt distribution in which the difference in the analyzed value of the Pt content measured in the radial direction of the disk is <=±10% can be obtd.
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