Practical equalizer for a perpendicular magnetic disk

We have developed a readback equalizer for a perpendicular magnetic disk with a commercial anisotropic magnetoresistive head for use with a PR4ML read channel with 8-9 coding. The transfer function of the perpendicular magnetic disk, derived by Fourier analysis, has a phase lag of 90/spl deg/ from t...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2002-11, Vol.38 (6), p.3684-3688
Main Authors: Ishikawa, K., Kishida, M., Kamijo, K., Taguchi, R., Okuda, H., Numazawa, J.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Applied sciences
Bit error rate
Channels
Coding
Criteria
Disk recording
Electronics
Equalizers
Exact sciences and technology
Fourier analysis
Magnetic analysis
Magnetic anisotropy
Magnetic devices
Magnetic disks
Magnetic heads
Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.)
domain-motion devices, etc
Magnetism
Perpendicular magnetic anisotropy
Perpendicular magnetic recording
Resistor-capacitor circuits
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Simulation
Transfer functions
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Summary:We have developed a readback equalizer for a perpendicular magnetic disk with a commercial anisotropic magnetoresistive head for use with a PR4ML read channel with 8-9 coding. The transfer function of the perpendicular magnetic disk, derived by Fourier analysis, has a phase lag of 90/spl deg/ from that of the longitudinal magnetic disk. We defined the parameters of the equalizer by simulation. The equalized readback signal nearly satisfied Nyquist's first criterion. Using resistor-capacitor circuits that correspond to the simulated function, we obtained a byte-error rate of below 10/sup -7/. Comparing the effect of incorporating PR4 or PR1 as part of the equalizer, we observed that PR4 gave a lower bit-error rate than PR1. Thus, PR4 is an effective detection method for a perpendicular magnetic disk. It is suitable not only for longitudinal magnetic disks, but also for perpendicular magnetic disks.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2002.804799