中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

12 records (took 0.017 seconds)

    Thin film magnetic recording medium
    2.
    发明专利
    Thin film magnetic recording medium 未知

    公开(公告)号：GB2278369B

    公开(公告)日：1997-01-15

    申请号：GB9410519

    申请日：1994-05-25

    Applicant: IBM

    Inventor： AHLERT RICHARD HENRY ,  HOWARD JAMES KENT ,  HYLTON TODD LANIER ,  PARKER MICHAEL ANDREW ,  ULLAH MUHAMMED INAYET

    IPC: C23C14/08 ,  C23C14/58 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/85 ,  G11B5/851 ,  C23C14/18

    Abstract: A high-density recording media comprising longitudinally oriented polycrystalline barium ferrite exhibits large coercivity, corrosion resistance, high hardness and durability. Films are prepared by on-axis sputtering at ambient temperatures from stoichiometric targets followed by a post-deposition anneal at approximately 850 DEG C. to induce crystallization. Crystallization yields a magnetic film with large in-plane remanence and a fine scale texturing that greatly improves the tribological performance of barium ferrite disks. Exceptional durability can be achieved on disks without overcoats. Grain sizes as small as 200 ANGSTROM are produced by doping with small amounts of Cr2O3 or other additives. Coercivities greater than 4000 Oe are achieved even in small grain films.

    3.
    发明专利
    未知

    公开(公告)号：DE3781712T2

    公开(公告)日：1993-04-01

    申请号：DE3781712

    申请日：1987-02-24

    Applicant: IBM

    Inventor： AHLERT RICHARD HENRY ,  HOWARD JAMES KENT ,  LIM GRACE SU

    IPC: G11B5/66 ,  G11B5/64 ,  G11B5/73 ,  G11B5/738 ,  G11B5/82 ,  H01F10/30

    Abstract: A magnetic recording medium is formed by depositing a layer of a cobalt-platinum magnetic alloy (which may also contain chromium) on a non-magnetic underlayer consisting of tungsten, molybdenum, niobium or vanadium. The magnetic alloy has a higher coercivity than when deposited on a chromium underlayer. The coercivity of the magnetic alloy becomes even higher when the substrate is maintained within such a temperature range during deposition of the magnetic alloy that an intermetallic compound of cobalt and the metal of the underlayer is formed at the interface between the magnetic alloy layer and the underlayer.

    6.
    发明专利
    未知

    公开(公告)号：DE69024379T2

    公开(公告)日：1996-07-18

    申请号：DE69024379

    申请日：1990-01-25

    Applicant: IBM

    Inventor： AHLERT RICHARD HENRY ,  KIM KWANG KON ,  HOWARD JAMES KENT ,  WU ANTHONY WAI

    IPC: G11B5/66 ,  G11B5/64 ,  G11B5/72 ,  G11B5/725 ,  G11B5/82

    Abstract: A thin film metal alloy magnetic recording disk has an improved protective overcoat which is both wear resistant and which creates a low level of stiction in a rigid disk file. In a preferred embodiment the overcoat is a film of essentially amorphous carbon or hydrogen-containing carbon with relatively small amounts of additives of iron (Fe), tungsten (W) or tungsten-carbide (WC). The structure of the overcoat is a relatively smooth planar carbon surface with discrete clusters of the additives which project slightly above the smooth carbon surface. The specific additives to the carbon overcoat improve the wear resistance of the disk and permit the sliders to contact the disks in contact start/stop (CSS) operation without damage to any of the disk file components.

    7.
    发明专利
    未知

    公开(公告)号：DE69024379D1

    公开(公告)日：1996-02-08

    申请号：DE69024379

    申请日：1990-01-25

    Applicant: IBM

    Inventor： AHLERT RICHARD HENRY ,  KIM KWANG KON ,  HOWARD JAMES KENT ,  WU ANTHONY WAI

    IPC: G11B5/66 ,  G11B5/72 ,  G11B5/64 ,  G11B5/725 ,  G11B5/82

    Abstract: A thin film metal alloy magnetic recording disk has an improved protective overcoat which is both wear resistant and which creates a low level of stiction in a rigid disk file. In a preferred embodiment the overcoat is a film of essentially amorphous carbon or hydrogen-containing carbon with relatively small amounts of additives of iron (Fe), tungsten (W) or tungsten-carbide (WC). The structure of the overcoat is a relatively smooth planar carbon surface with discrete clusters of the additives which project slightly above the smooth carbon surface. The specific additives to the carbon overcoat improve the wear resistance of the disk and permit the sliders to contact the disks in contact start/stop (CSS) operation without damage to any of the disk file components.

    8.
    发明专利
    未知

    公开(公告)号：DE3781712D1

    公开(公告)日：1992-10-22

    申请号：DE3781712

    申请日：1987-02-24

    Applicant: IBM

    Inventor： AHLERT RICHARD HENRY ,  HOWARD JAMES KENT ,  LIM GRACE SU

    IPC: G11B5/66 ,  G11B5/64 ,  G11B5/73 ,  G11B5/738 ,  G11B5/82 ,  H01F10/30

    Abstract: A magnetic recording medium is formed by depositing a layer of a cobalt-platinum magnetic alloy (which may also contain chromium) on a non-magnetic underlayer consisting of tungsten, molybdenum, niobium or vanadium. The magnetic alloy has a higher coercivity than when deposited on a chromium underlayer. The coercivity of the magnetic alloy becomes even higher when the substrate is maintained within such a temperature range during deposition of the magnetic alloy that an intermetallic compound of cobalt and the metal of the underlayer is formed at the interface between the magnetic alloy layer and the underlayer.

Patent Agency Ranking