公开(公告)号：DE69012259D1

公开(公告)日：1994-10-13

申请号：DE69012259

申请日：1990-06-21

Applicant: IBM

Inventor： HOWARD JAMES KENT ,  SIMMONS RANDALL GEORGE ,  YOGI TADASHI

IPC: C23C14/14 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/85 ,  G11B5/851 ,  H01F10/16 ,  H01F41/18

Abstract: An improved CoPt alloy magnetic recording disk for horizontal recording has a magnetic recording layer which includes oxygen, the oxygen being present preferably in the range of approximately 5 to 30 atomic percent. The resulting disk structure has substantially decreased intrinsic media noise at high linear recording density.

公开(公告)号：DE69012259T2

公开(公告)日：1995-03-30

申请号：DE69012259

申请日：1990-06-21

Applicant: IBM

Inventor： HOWARD JAMES KENT ,  SIMMONS RANDALL GEORGE ,  YOGI TADASHI

IPC: C23C14/14 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/85 ,  G11B5/851 ,  H01F10/16 ,  H01F41/18

Abstract: An improved CoPt alloy magnetic recording disk for horizontal recording has a magnetic recording layer which includes oxygen, the oxygen being present preferably in the range of approximately 5 to 30 atomic percent. The resulting disk structure has substantially decreased intrinsic media noise at high linear recording density.

公开(公告)号：SG52460A1

公开(公告)日：1998-09-28

申请号：SG1996004856

申请日：1993-07-23

Applicant: IBM

Inventor： DOERNER MARY FRANCES ,  YOGI TADASHI ,  WU ANTHONY WAI ,  LANE BRIAR RANCH ,  PARKER DAN STEPHEN

IPC: G11B5/72 ,  G11B5/73 ,  G11B5/738 ,  G11B5/82 ,  G11B5/84 ,  G11B5/851 ,  G11B25/04 ,  G11B33/14 ,  G11B5/66 ,  G11B5/62 ,  G11B5/70 ,  G11B5/85

Abstract: A magnetic recording disk has both an extremely smooth top surface and high coercivity, and is incorporated in a contact recording disk file which requires an extremely smooth head-disk interface and a disk with high coercivity. A superfinished untextured NiP coating on a disk substrate is oxidized to form a NiO film. The NiO film permits the subsequently sputter deposited magnetic layer to have much higher coercivity, which enables the disk to be used in contact recording applications. The NiO film and the later deposited layers making up the disk, including the top protective overcoat, conform to the smooth surface of the polished NiP, thus preserving the extremely smooth surface of the top layer of the disk, which is required for the head-disk interface in contact recording disk files. In the preferred process for forming the NiO film on the substrate, the substrate is annealed in air at a temperature below that which would cause the NiP film to crystallize.