| 摘要 |
PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium having a high S/N ratio and high thermal agitation resistance and to provide a manufacturing method thereof. SOLUTION: A perpendicular magnetic recording layer as a magnetic layer is provided with magnetic crystal grains and a crystal grain boundary interposed between the magnetic crystal grains and composed of a non-magnetic layer. In the manufacturing method of the perpendicular magnetic recording medium for forming at least the magnetic layer on a substrate, a correlation between the thickness of the grain boundary and a magnetization inversion nucleation field Hn is previously calculated, the thickness of the grain boundary for a prescribed magnetization inversion nucleation field Hn is determined based on the correlation and the medium is manufactured with the determined thickness of the grain boundary. COPYRIGHT: (C)2008,JPO&INPIT
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