发明授权
- 专利标题: Barium ferrite thin film for longitudinal recording
- 专利标题(中): 钡铁氧体薄膜用于纵向记录
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申请号: US69060申请日: 1993-05-28
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公开(公告)号: US5492775A公开(公告)日: 1996-02-20
- 发明人: Richard H. Ahlert , James K. Howard , Todd L. Hylton , Michael A. Parker , Muhammad I. Ullah
- 申请人: Richard H. Ahlert , James K. Howard , Todd L. Hylton , Michael A. Parker , Muhammad I. Ullah
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: C23C14/08
- IPC分类号: C23C14/08 ; C23C14/58 ; G11B5/64 ; G11B5/65 ; G11B5/66 ; G11B5/85 ; G11B5/851
摘要:
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.degree.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 .ANG. are produced by doping with small amounts of Cr.sub.2 O.sub.3 or other additives. Coercivities greater than 4000 Oe are achieved even in small grain films.
公开/授权文献
- USD398409S Illuminated cab sign 公开/授权日:1998-09-15