Abstract
RECENTLY, Humphrey and Clow1 found that flux reversal in multilayer films2, consisting of 200 Å thick nickel–iron films interleaved with silicon monoxide layers each about 100 Å thick, was much faster than that observed in normal single films. A possible explanation for this fast flux reversal might be that domain wall motion is much faster in multilayer than in single films. To verify this assumption, Patton and Humphrey3 have measured wall velocities in double films. For small driving fields, the wall velocity obeys the relation in which H is the applied field, Hc the wall motion coercive force and m the so-called wall mobility. Patton and Humphrey found that—contrary to expectation—the wall mobilities in double and in single films were about the same.
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References
Humphrey, F. B., and Clow, H., Nature, 204, 769 (1964).
Clow, H., Nature, 194, 1035 (1962).
Patton, C. E., and Humphrey, F. B., J. App. Phys., 37, 1270 (1966).
Middelhoek, S., IBM J. Research Develop. (to be published).
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MIDDELHOEK, S., WILD, D. Fast Domain Wall Motion in Double Nickel–Iron Films. Nature 211, 1169 (1966). https://doi.org/10.1038/2111169a0
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DOI: https://doi.org/10.1038/2111169a0
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