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AssigneeInternational Business Machines Corporation
InventorsRichard H. Ahlert, James K. Howard, Todd L. Hylton, Michael A. Parker, Muhammad I. Ullah
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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.
A thin film magnetic recording medium comprising:
A thin film magnetic recording medium comprising:
A thin film magnetic recording medium comprising:
A thin film magnetic recording medium comprising:
Dependencies are inferred from the claim text.