NDLI: A magnetic recording simulation program having an improved fit to actual hysteresis loops

Content Provider	IEEE Xplore Digital Library
Author	Portigal, D.
Copyright Year	1965
Abstract	In recent years a better understanding of the magnetic recording process has resulted from self-consistent iterative calculations of the magnetization transition induced in the recording medium. One important limitation on these calculations has been the difficulty in fitting realistic hysteresis loops into these calculations. It is not practical to include the actual hysteresis loops, so the practice has been to approximate them by various plausible models. However, none of these models fit the actual loops as closely as would be desired. In this paper, we avoid modelling the major loops, but approximate them using spline interpolation. We demonstrate, by comparison with experimental loops, that the actual loops can be approximated much more closely than with an analytic model. A criterion for deriving the minor loops is given, and we demonstrate a generally better fit of the initial minor loops than that obtained from a model. A self-consistent iterative calculation is made using both an analytic model and the spline approximated loops. We find that the choice of loop model noticeably affects the calculated magnetization distribution and that the spline approximated loops lead to a transition width which more closely matches the width estimated from an experimental single readback pulse. In summary, we demonstrate that good simulation of the hysteresis loops can be significant and discuss a simple approximation technique from which an excellent fit to actual loops can be obtained.
Sponsorship	IEEE Magnetics Society
Starting Page	934
Ending Page	941
Page Count	8
File Size	745753
File Format	PDF
ISSN	00189464
Volume Number	11
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1975-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic recording Magnetic hysteresis Magnetization Spline Computational modeling Interpolation Distributed computing History Magnetic materials Space vector pulse width modulation
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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