Browse Prior Art Database

Magnetic Film Disk with Mechanically Hard Underlayer

IP.com Disclosure Number: IPCOM000038001D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Ahlert, RH: AUTHOR [+3]

Abstract

Disclosed is a film-disk structure for magnetic recording applications, which provides improved durability under conditions of start/stop contact with the recording transducer.

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Magnetic Film Disk with Mechanically Hard Underlayer

Disclosed is a film-disk structure for magnetic recording applications, which provides improved durability under conditions of start/stop contact with the recording transducer.

The substrate hardness is a significant factor affecting the durability of metal- film recording media. The start/stop performance of film media deposited on polished AlMg/NiP substrates using carbon overcoats is very sensitive to the substrate hardness. It is found that sputtered underlayers of tungsten and tungsten compounds (WTi, WC) significantly improve disk durability, compared to conventional underlayers of chromium. An underlayer thickness of 1500-3000 Angstroms typically fails before 500 cycles, while disks with W, WC or WTi underlayers show improved durabilities, with lifetimes between 2,000 and 12,000 start/stop cycles. The typical media structure consists of the thick tungsten-alloy underlayer, magnetic layer (approximately 300 Angstroms Co-based alloy) and carbon overcoat (200 Angstroms).

Disclosed anonymously.

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