| 摘要 |
PROBLEM TO BE SOLVED: To achieve both the reduction of the write core width and the acquisition of a high S/N ratio by suppressing both a particle diameter variation and crystal orientation variation in a perpendicular magnetic recording medium having a recording layer wherein magnetic crystal particles are separated from one another by a gap in an in-plane direction. SOLUTION: The perpendicular magnetic recording medium (10) has a substrate (11), a soft magnetic buffer layer (12) formed on the substrate, an Ru/Ru alloy underlayer (14, 15) formed on the soft magnetic buffer layer and including Ru or a Ru alloy, a recording layer (16) formed on the underlayer and having a multilayer or single-layer structure including at least a layer including a plurality of magnetic particles each having a magnetization-easy axis oriented perpendicularly to the substrate, and a non-magnetic material surrounding the plurality of magnetic particles, and a layered structure (30, 30A to 30E) interposed between the soft magnetic buffer layer and the underlayer and including at least a crystalline structure film (21) including Ru or a Ru alloy, a first polycrystalline film (25), and a second polycrystalline film (22). COPYRIGHT: (C)2009,JPO&INPIT
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