| 摘要 |
IN A MAGNETIC RECORDING MEDIUM, SURFACE ROUGHNESS OF A GLASS SUBSTRATE (1) AND THE VARIATION OF THE SURFACE ROUGHNESS ARE SUPPRESSED. NAMELY, THE SURFACE ROUGHNESS (RMAX, RA, RQ) AND THE RELATION (RMAX/RA) BETWEEN RMAX AND RA ARE RESTRICTED. RA IS REPRESENTATIVE OF A CENTER-LINE MEAN ROUGHNESS, RMAX IS DEFINED AS A MAXIMUM HEIGHT REPRESENTATIVE OF A DIFFERENCE BETWEEN A HIGHEST POINT AND A LOWEST POINT AND RQ IS REPRESENTATIVE OF A ROOT MEAN SQUARE ROUGHNESS. THEREBY, CRYSTAL GRAINS OF AN UNDERLYING LAYER (2,3,5) AND A MAGNETIC LAYER (6) FORMED THEREON ARE EQUALIZED. THE SURFACE ROUGHNESS IS SPECIFIED BY RMAX < 15 NM, RA < 1 NM AND RQ < 1.5 NM AND THE RATIO BETWEEN THE SURFACE ROUGHNESS RMAX AND THE SURFACE ROUGHNESS RA IS IN THE RANGE OF 10 TO 30. |
