Abstract
THE earliest measurements relating the rate of change of flux to applied field under pulsed conditions were made by Sixtus and Tonks1. They measured the rate of propagation along a nickel wire of a wave-front of flux change and so obtained a measure of its magnetic ‘viscosity’. More recently, Galt2 has performed similar measurements involving a single domain wall in a crystal of nickel–iron ferrite. Since then, I have made measurements of magnetic viscosity in polycrystalline magnesium–manganese ferrite (‘Ferroxcube’ D1) during continuous hysteresis loop tracing, this particular ferrite exhibiting a rectangular hysteresis loop.
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References
Sixtus, K. J., and Tonks, L., Phys. Rev., 37, 930 (1931); 42, 419 (1932).
Galt, J. K., Bell System Tech. J., 33, 1023 (1954).
George, R. G., Engineering, 182, 333 (1956).
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GEORGE, R. Magnetic Viscosity displayed on Hysteresis Loop Traces. Nature 183, 245 (1959). https://doi.org/10.1038/183245a0
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DOI: https://doi.org/10.1038/183245a0
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