| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic storage having high reliability at a recording density of >=4 giga-bit per square inch. SOLUTION: This intra-surface magnetic recording medium has a structure obtd. by forming a first magnetic layer 13 via a ground surface layer 12 on a substrate 11, forming an intermediate layer 14 on this first magnetic layer 13 and forming a second magnetic layer 15 on this intermediate layer 14. The coercive force of the first magnetic layer 13 is 100 to 2,000 Oe. The intermediate layer 14 is nonmagnetic or has the saturation magnetization smaller than that of the first magnetic layer 13 and the second magnetic layer 15. All of the first magnetic layer 13, the intermediate layer 14 and the second magnetic layer 15 are composed of crystal grains having substantially a hexagonal close- packed structure. The preferential growth bearings of the crystal grains of the first magnetic layer 13, the crystal grains of the intermediate layer 14 and the crystal grains of the second magnetic layer 15 are equal. The intra-surface magnetic recording medium described above is used. As a result, the high device S/N and low bit error rate are obtd. at the recording density of >=4 giga-bit per square inch and the average fault intervals may be made to >=300,000 hours.
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