NDLI: Fluss-rückschluss in magnetischen dünnfilmspeichern

Content Provider	IEEE Xplore Digital Library
Author	Feltl, H. Harloff, H.
Copyright Year	1965
Abstract	An isotropic soft magnetic layer as a "flux keeper" on top of a magnetic thin-film memory matrix reduces the stray fields of both the film spots and the drive lines. The magnetostatic field distribution around and within a homogeneously magnetized rectangular film spot near a homogeneous, isotropic magnetic layer of a) infinite and b) finite thickness is calculated. Problem a has been solved in three dimensions by introducing image magnetizations. A solution of problem b in two dimensions has been derived using a special mathematical method to obtain and to superpose particular solutions of Poisson's equation. As results, the demagnetizing field and the part of the flux closing through the substrate are given in dependence on the flux keeper's permeability, thickness, and distance from the film. The field of a stripline below the flux keeper is also calculated with some simplifications. Increase of usable drive field and decrease of stray field of the lines dependent on geometry and keeper's permeability are shown. As shown by measurements, the modification of the static and dynamic fields of spots and lines leads to considerable improvements in sense voltages as well as in disturb and switching thresholds of the film spots. The results are discussed with respect to the contributions of the various field effects.
Sponsorship	IEEE Magnetics Society
Starting Page	516
Ending Page	520
Page Count	5
File Size	594047
File Format	PDF
ISSN	00189464
Volume Number	2
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1966-09-01
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 flux Magnetostatics Soft magnetic materials Magnetic films Permeability Transmission line matrix methods Poisson equations Demagnetization Substrates Stripline
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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