Dynamics of magnetic flux lines in the presence of correlated disorder
Abstract
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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