Resonance effects for different states of a circulating bubble

The influence of an RF field superimposed on the DC bias on the tangential drive requirement of a moving bubble was measured. The bubble was maintained in continuous circular motion in a rotating gradient apparatus. With appropriate amplitude and frequency of RF field, the drive field required to mo...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1988-11, Vol.24 (6), p.3054-3056
Main Authors: Yanai, M., Friedlaender, F.J., Nyenhuis, J.A., Theile, J.
Format: Article
Language:English
Subjects:
Conductors
Drives
Electric variables measurement
Frequency
Gradient methods
Magnetic field measurement
Magnetic materials
Performance evaluation
Resonance
Rotation measurement
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Summary:The influence of an RF field superimposed on the DC bias on the tangential drive requirement of a moving bubble was measured. The bubble was maintained in continuous circular motion in a rotating gradient apparatus. With appropriate amplitude and frequency of RF field, the drive field required to move the bubble could be reduced. A minimum in the drive field occurred at an RF frequency of about 20 MHz. The measurements were performed for bubbles with and without Bloch lines. There was no discernible difference in drive field requirement between S=1 and S=0 bubbles. A harmonic oscillator model for the radial motion combined with the standard model for coercive pressure was used to calculate the expected velocity versus tangential drive relation. The principal features of the experimental results were borne out in the calculations.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.92332