| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic recording medium which has superior magnetic characteristics and electromagnetic conversion characteristics and realizes stable high-density recording less affected by thermal disturbance. SOLUTION: A plastic resin substrate 1 made of a non-heated polycarbonate, a polyolefin or the like is used. A magnetic layer 4 is constituted of a granular structure comprising ferromagnetic crystal particles having a hexagonal closest packed structure and nonmagnetic grain boundaries which exist between the ferromagnetic crystal particles and essentially consist of an oxide. A base layer 2 has a body-centered cubic lattice structure. A nonmagnetic intermediate layer 3 having a hexagonal closest packed structure which is constituted of a nonmagnetic metal essentially consisting of at least one of Ru, Os, and Re and has the hcp (100) face as a preferential crystal orientation face is provided between the magnetic layer 4 and the foundation layer 2. The mismatching (Δa) between the a-axis lattice constant of the ferromagnetic crystal particles and that of the nonmagnetic metal constituting the nonmagnetic intermediate layer 3 is≤6%, mismatching (Δc) between the c-axis lattice constants is≤4%, and a ratioΔa/Δc is≥1.5. COPYRIGHT: (C)2003,JPO
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