公开(公告)号：JPH09190945A

公开(公告)日：1997-07-22

申请号：JP28401896

申请日：1996-10-25

Applicant: IBM

Inventor： JIEEMUZU KENTO HAWAADO ,  RANDAARU JIYOOJI SHIMONZU ,  TADASHI YOGI

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

Abstract: PROBLEM TO BE SOLVED: To reduce intrinsic noise of a recording medium. SOLUTION: In the case of an improved CoPt alloy magnetic recording disk for horizontal recording, the magnetic recording layer in the disk contains oxygen more than 5 atomic percent but less than 30 atomic percent. The disk is formed by taking oxygen in argon when sputtering for CoPt alloy magnetic layer. The disk construction obtained has considerably less noise of intrinsic medium even though the recording line density is high under the same conditions compared to that of a disk construction formed without taking in oxygen during sputtering for CoPt alloy magnetic layer. S/N ratio can be further improved by giving a head treatment to the disk after the sputtering process.

公开(公告)号：JPH0376018A

公开(公告)日：1991-04-02

申请号：JP20532390

申请日：1990-08-03

Applicant: IBM

Inventor： JIEEMUZU KENTO HAWAADO ,  RANDAARU JIYOOJI SHIMONZU ,  TADASHI YOGI

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

Abstract: PURPOSE: To provide a CoPt alloy disk which decreases intrinsic medium noises even at a high recording line density by forming a magnetic layer of a compsn. contg. cobalt, platinum and oxygen and specifying the quantity of oxygen. CONSTITUTION: The magnetic recording layer in a disk contains oxygen of about 5atm.%, more preferably about 5 to 30atm.%. The disk is formed by introducing oxygen into argon during the adhesion of a CoPt alloy magnetic layer by sputtering. The resulted disk structure produces the considerably decreased intrinsic medium noises even at the high recording line density as compared with the disk structure formed under the similar conditions provided that the oxygen is not introduced into the argon during the adhesion of the CoPt alloy magnetic layer by sputtering. The disk is heat-treated after the adhering stage by sputtering, by which the S/N is further improved. The CoPt alloy disk having the decreased intrinsic medium noise even at the high recording line density is thus obtd.