Abstract
We have studied the dynamical motion of flux lines in melt-processed Y-Ba-Cu-O during the pulsed-field magnetization (PFM) process using a pick-up coil technique. The change of the magnetic flux density and the velocity of flux lines during the application of a magnetic pulse were evaluated from the experimental data. It is shown that viscous force exerted on flux lines plays an important roll in the PFM process. For strong magnetic pulses, the velocity of flux lines does not change monotonically with the external field, but exhibits a peak in the time dependence. This result can be accounted for by the heat generation due to the resistive motion of flux lines.
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