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High bit density (100 Mb/cm2) with single-layer Co-Cr media and ring heads in perpendicular magnetic recording

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6 Author(s)
Luitjens, S.B. ; Philips Res. Lab., Eindhoven, Netherlands ; de Bie, R.W. ; Zieren, V. ; Bernards, J.P.C.
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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

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Magnetics, IEEE Transactions on  (Volume:24 ,  Issue: 6 )