公开(公告)号：DE10026050A1

公开(公告)日：2000-12-28

申请号：DE10026050

申请日：2000-05-25

Applicant: IBM DEUTSCHLAND INFORMATIONSSY

Inventor： FULLERTON ERIC EDWARD ,  MARGULIES DAVID THOMAS ,  MARINERO ERNESTO ESTEBAN ,  SCHABES MANFRED ERND

IPC: G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/851 ,  H01F10/14 ,  H01F10/16 ,  H01F10/28 ,  H01F10/30 ,  H01F41/16 ,  H01F41/32 ,  G11B5/62

Abstract: Magnetic recording medium comprises a substrate (11), a support (13) on the substrate, a granular ferromagnetic base layer (15) made of a Co alloy on the support and having a thickness of 1-30 nm, and a ferromagnetic coating (17) formed on and in contact with the base layer and comprising an element selected from Co, Fe and Ni. The coating has an effective thickness of 1-40 angstroms. An Independent claim is also included for a process for the production of the recording medium.

公开(公告)号：DE10026050A8

公开(公告)日：2004-09-02

申请号：DE10026050

申请日：2000-05-25

Applicant: IBM

Inventor： FULLERTON ERIC EDWARD ,  MARGULIES DAVID THOMAS ,  MARINERO ERNESTO ESTEBAN ,  SCHABES MANFRED ERND

IPC: G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/851 ,  H01F10/14 ,  H01F10/16 ,  H01F10/28 ,  H01F10/30 ,  H01F41/16 ,  H01F41/32 ,  G11B5/62

Abstract: A magnetic recording disk has a magnetic recording layer that includes a ferromagnetic host layer and a ferromagnetic overlay deposited directly on the host layer with an effective overlay thickness in the range of 1-40 Angstroms. The ferromagnetic material used in the overlay contains Co, Fe and/or Ni and has a magnetic moment significantly greater than that of the material in the ferromagnetic host layer. The ferromagnetic overlays improve the thermal stability of superparamagnetic grains contained within the host layers by magnetically coupling the grains through bridging. The enhanced thermal stability of the media allows for the use of thinner ferromagnetic host layers, and leads to lower remanent magnetization-thickness product (Mrt) values and higher recording densities.