Keepered media/contact head performance or life beyond contact recording

Longitudinal thin-film rigid disk media with an overlying high permeability, low coercivity "keeper" layer is shown to improve inductive head performance beyond the limit of contact recording. Data taken with a Read-Rite tripad pseudo-contact inductive thin-film head shows that the keeper...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1996-09, Vol.32 (5), p.3581-3583
Main Authors: Reed, W., Cohen, U., Hollars, D., Zubeck, R., Gooch, B., Loven, J., Judy, J.H.
Format: Article
Language:English
Subjects:
Contacts
Error analysis
Inductance
Magnetic heads
Magnetic recording
Performance loss
Permeability
Saturation magnetization
Soft magnetic materials
Transistors
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Summary:Longitudinal thin-film rigid disk media with an overlying high permeability, low coercivity "keeper" layer is shown to improve inductive head performance beyond the limit of contact recording. Data taken with a Read-Rite tripad pseudo-contact inductive thin-film head shows that the keeper layer improves peak-detector channel margin by 25% and reduces soft error rate by 6 orders of magnitude. The keeper layer improves system signal to noise ratio by 3 dB to 6 dB, and reduces PW-50 from 0.292 /spl mu/m (11.5 /spl mu/in) to 0.228 /spl mu/m (9.0 /spl mu/in). A fly height study shows that the keeper layer allows an additional 25 nm (1 /spl mu/in) higher flying height than standard media for equivalent channel margin or soft error rates. A model, treating the keeper layer as a magnetic parametric amplifier is proposed. Calculations show that the keeper layer modulates the inductance of the tripad head by 25 nano-Henrys, or about 5% of the total inductance.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.538696