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Title: Medium noise in longitudinal thin film disk media above 20 Gb/in2
Authors: Wei, D. 
Ong, C.K. 
Issue Date: Sep-2000
Citation: Wei, D.,Ong, C.K. (2000-09). Medium noise in longitudinal thin film disk media above 20 Gb/in2. IEICE Transactions on Electronics E83-C (9) : 1494-1499. ScholarBank@NUS Repository.
Abstract: 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 135 angstrom 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 14.3 Gb/in2 to 31.5 Gb/in2. The peak-amplitude noise is studied by the distribution of the peak magnetization Mp in each bit. The distribution of Mp develops from a delta-function around the remanence Mr 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 Mrδ, 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.
Source Title: IEICE Transactions on Electronics
ISSN: 09168524
Appears in Collections:Staff Publications

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