公开(公告)号：JP2000207727A

公开(公告)日：2000-07-28

申请号：JP35777399

申请日：1999-12-16

Applicant: IBM

Inventor： AHLERT RICHARD H ,  JAMES KENT HOWARD ,  LAMBERT STEVEN E ,  SANDERS IAN L

IPC: G11B5/673 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/716 ,  G11B5/738

Abstract: PROBLEM TO BE SOLVED: To reduce inherent medium noise significantly under a high line recording density by employing a laminate structure of a relatively thin CoPt alloy magnetic film or a CoNi alloy magnetic film separated by a relatively thin nonmagnetic spacer film. SOLUTION: Surface of a substrate is cleaned by RF discharge and a lower layer (300-400 Å thick) of Mo, Cr or CrV is attached by sputtering before being laminated with a magnetic layer. Subsequently, a magnetic layer (magnetic film and spacer) is attached through sputtering by changing the sputtering source to form a laminate structure. Effect of lamination on a signal is minimized and noise reduction is enhanced significantly as the number of laminated films increases. A laminate structure CoPt alloy disc thus produced exhibits excellent low noise characteristic as compared with a single thick CoPt alloy film.