Medium Noise in Longitudinal Thin Film Disk Media above 20Gb/in^2(Special Issue on Selected Papers from the 4th Asian Symposium for Information Storage Technology)
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概要
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Medium noise is the dominant noise in ultrahigh density disk recording systems. The peak, width and jitter noise are analyzed by micromagnetic simulations. Four different media, with a fixed grain size of 135Å and a coercivity of 2900 Oe, are chosen for medium noise analysis. The linear recording density is increased from 340 KFCI(Kilo flux-changes per inch) to 750 KFCI, while the area density goes up from 14.3Gb/in^2 to 31.5Gb/in^2. The peak-amplitude noise is studied by the distribution of the peak magnetization M_p in each bit. The distribution of M_p develops from a delta-function around the remanence M_r at low densities to a flat distribution at extremely high densities. It is found that the transition a-parameter is no longer proportional to the square root of M_rδ, as given in the William-Comstock approximation. The peak-jitter noise in the read back voltage is analyzed by the percentage of the transition jitter in a bit length.
- 社団法人電子情報通信学会の論文
- 2000-09-25
著者
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Ong C
Center For Superconducting And Magnetic Materials And Department Of Physics National University Of S
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WEI Dan
Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua Universi
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ONG Chong
Center for Superconducting and Magnetic Materials and Department of Physics, National University of
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Wei Dan
Laboratory Of Advanced Materials Department Of Materials Science And Engineering Tsinghua University
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Wei Dan
Laboratory Of Advanced Materials Department Of Materials Science And Engineering Tsinghua University
関連論文
- Improvement of Read Back Properties in HDD with PRML Signal Processing Method(Recent Progress of High-Density Disk Storage)
- Medium Noise in Longitudinal Thin Film Disk Media above 20Gb/in^2(Special Issue on Selected Papers from the 4th Asian Symposium for Information Storage Technology)
- Thermodynamic Behavior of a Nano-Sized Magnetic Grain near the Superparamagnetic Limit(Recent Progress of High-Density Disk Storage)