公开(公告)号：JPH02281414A

公开(公告)日：1990-11-19

申请号：JP6286890

申请日：1990-03-15

Applicant: IBM

Inventor： RICHIYAADO HENRII AARERUTO ,  JIEEMUZU KENTO HAWAADO ,  SUTEIBUN YUUJIN RANBAATO ,  IAN RIYUUZU SANDAAZU

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

Abstract: PURPOSE: To suppress noises down to the max. permissible level or below and to enable the recording of data at the max. linear density by making a magnetic recording layer have a laminated structure of relatively thin Copt alloy magnetic films or CoNi alloy magnetic films parted by relatively thin non-magnetic spacer films. CONSTITUTION: The laminated magnetic layer on a substrate consist of the alternate films of the magnetic films of a cobalt base contg. platinum or nickel in the alloy and non-magnetic spacer films. The laminated layers have >=2 sheets of the magnetic films and one sheet of the spacer film. The intrinsic medium noises of the laminated disk structure obtd. in such a manner are decreased at the high linear recording density and the advantage of the improved signal to noise ratio is best achieved when the non-magnetic spacer films are formed as thin as possible, i.e., the spacer films are maintained at the thickness sufficient for effectively shutting off the characteristics of the magnetic films to be adhered afterward.