NDLI: Dynamics of bubbles in field access devices studied using a high speed optical sampling microscope

Content Provider	IEEE Xplore Digital Library
Author	Kobayashi, T. George, P. Humphrey, F.
Copyright Year	1965
Abstract	Dynamics of bubbles in field access devices operated at 100 kHz and 200 kHz have been studied using a high speed optical sampling microscope capable of making a 10 nsec single exposure photograph at a known sampling time with respect to a rotating field orientation. By scanning the sampling time through one rotating field cycle, a series of time-sequenced transient domain configurations of bubbles have been recorded on 16 mm film. The devices studied were commonly used permalloy propagating structures, T-bar, T-X, X-bar, and chevron fabricated on an epitaxial garnet film. From each frame of the 16 mm film, plots of the position of the leading and trailing edges of a bubble as a function of rotating field angle were made. These position plots revealed very nonuniform bubble motion in these circuits. The instantaneous velocities of the leading and trailing edges of the bubble were calculated from the position plots. The results show a large velocity variation in all circuits, the ratio of the maximum velocity to the average velocity ranging from 3.5 for the X-bar to 4.8 for the chevron. Maximum vetocities in excess of that predicted on the basis of the critical velocity for dynamic conversion were observed.
Sponsorship	IEEE Magnetics Society
Starting Page	202
Ending Page	208
Page Count	7
File Size	764989
File Format	PDF
ISSN	00189464
Volume Number	12
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1976-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical microscopy High speed optical techniques Optical devices Sampling methods Optical films Aerodynamics Light sources Circuits Optical propagation Garnets
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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