DocumentCode :
1063376
Title :
Nonlinear effects of transition broadening
Author :
Moon, Jaekyun ; Zhu, Jian-Gang
Author_Institution :
Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA
Volume :
27
Issue :
6
fYear :
1991
fDate :
11/1/1991 12:00:00 AM
Firstpage :
4831
Lastpage :
4833
Abstract :
Nonlinear broadening of closely spaced transitions has been studied using micromagnetics simulations. Results show a large increase in the width of a transition due to the demagnetizing field effect of earlier transitions. Based on this observation, a simple recording channel model is developed to investigate the effects of nonlinear transition broadening on detection performance. This analysis shows that the conventional peak detector is much less sensitive to the detrimental effects of nonlinearity than the more advanced partial response maximum likelihood (PRML) scheme, mainly due to the extra transition spacing provided by the minimum run-length-limited constraint. This result suggests that in order to preserve the improved signal detection capability of advanced signal processing schemes like PRML, reduction of nonlinearity is essential in the media design
Keywords :
codes; magnetic recording; signal detection; signal processing; PRML scheme; demagnetizing field effect; detection performance; magnetic recording channels; micromagnetics simulations; minimum run-length-limited constraint; nonlinear effects; partial response maximum likelihood scheme; peak detector; signal detection capability; simple recording channel model; transition broadening; Crystallization; Demagnetization; Detectors; Magnetic heads; Magnetization; Maximum likelihood detection; Micromagnetics; Moon; Signal detection; Signal processing;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.278961
Filename :
278961
Link To Document :
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