公开(公告)号：GB2278369A

公开(公告)日：1994-11-30

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.

公开(公告)号：DE3780347D1

公开(公告)日：1992-08-20

申请号：DE3780347

申请日：1987-04-22

Applicant: IBM

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

IPC: G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/706 ,  G11B5/73 ,  G11B5/738 ,  G11B5/70