Abstract
We present a detailed study of the dynamic interactions between Josephson vortices and stacks of pancakevortices in a Bi2Sr2CaCu2O8 single crystal, obtained by measuring the effect of applied in-plane magnetic field pulses on thec-axis magnetization. The predominant interaction relaxes the system towards equilibrium.However, using a highly sensitive AC technique we are able to measure also the forcesacting to drive the system away from equilibrium, consistent with the existence of dragginginteractions between the Josephson and pancake systems. Such forces were discussedrecently as the basis of possible flux ratchet devices.
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