Dynamics of magnetic flux lines in the presence of correlated disorder
Bullard, Thomas J. · Das, Jayajit · Tauber, Uwe C.
Original · EN
We investigate the dynamics of interacting magnetic flux lines driven by an external current in the presence of linear pinning centers, arranged either in a periodic square lattice or placed randomly in space, by means of three-dimensional Monte Carlo simulations. Compared to the non-interacting case, the repulsive forces between the vortices reduce the critical current Jc, as determined from the depinning threshold in the current-voltage (I-V) characteristics. Near the depinning current Jc, the voltage power spectrum S(w) reveals broad-band noise, characterized by a 1/wᵃ power law decay with a <= 2. At larger currents the flux lines move with an average velocity vcm. For a periodic arrangement of columnar pins with a lattice constant d and just above Jc, distinct peaks appear in the voltage noise spectrum S(w) at w vcm/d which we interpret as the signature of stick-slip flux line motion.
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