| 摘要 |
THE PROVIDE A MAGNETIC RECORDING MEDIUM THAT EXHIBITS A HIGH COERCIVE FORCE AND SUPPRESSES THE NOISES CAUSED THEREFROM AT A LOW LEVEL.THE MAGNETIC RECORDING MEDIUM ACCORDING TO THE INVENTION INCLUDES A NONMAGNETIC SUBSTRATE 1; A NONMAGNETIC UNDERCOATING LAYER 2 ON THE SUBSTRATE 1, THE UNDERCOATING LAYER 2 HAVING A HEXAGONAL CLOSE PACKING STRUCTURE OR A COMBINATION OF A HEXAGONAL CLOSE PACKING STRUCTURE AND A BODY CENTER CUBIC STRUCTURE; A NONMAGNETIC INTERMEDIATE LAYER 3 ON THE UNDERCOATING LAYER 2, THE INTERMEDIATE LAYER 3 HAVING A HEXAGONAL CLOSE PACKING STRUCTURE OR A COMBINATION OF A HEXAGONAL CLOSE PACKING STRUCTURE AND A BODY CENTER CUBIC STRUCTURE; AND A MAGNETIC LAYER 4 ON THE INTERMEDIATE LAYER 3, THE MAGNETIC LAYER 4 HAVING A GRANULAR STRUCTURE FORMED OF FERROMAGNETIC CRYSTAL GRAINS AND OXIDE GRAIN BOUNDARIES OR NITRIDE GRAIN BOUNDARIES SURROUNDING THE FERROMAGNETIC CRYSTAL GRAINS. (FIG. 1)
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