Title :
High bit density (100 Mb/cm2) with single-layer Co-Cr media and ring heads in perpendicular magnetic recording
Author :
Luitjens, S.B. ; de Bie, R.W. ; Zieren, V. ; Bernards, J.P.C. ; Schrauwen, C.P.G. ; Cramer, H.A.J.
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
fDate :
11/1/1988 12:00:00 AM
Abstract :
The signal and noise of single-layer Co79Cr21 media are measured with ring heads to estimate the area density that can be achieved. Densities as high as 100 Mb/cm2 (1 μm2/bit) are expected when a signal-to-noise ratio sufficient for an error probability less than 10 -5 is required. As a comparison, densities estimated from data from metal-evaporated tape and CrO2 tape are given. In the frequency response of the single-layer media, an additional minimum was observed for a wavelength slightly larger than the gap length. This is probably caused by the bipolar nature of the perpendicular recording field of a ring head
Keywords :
chromium alloys; cobalt alloys; magnetic heads; magnetic recording; CrO2 tape; area density; error probability; frequency response; gap length; metal-evaporated tape; perpendicular magnetic recording; ring heads; signal-to-noise ratio; single-layer Co-Cr media; single-layer media; Area measurement; Coercive force; Digital recording; Ferrites; Frequency measurement; Frequency response; Magnetic heads; Noise measurement; Signal to noise ratio; Wavelength measurement;
Journal_Title :
Magnetics, IEEE Transactions on
