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