Manipulation of magnetic-flux landscapes in superconducting crystalsD. Cole1, S. J. Bending1, S. Savel'ev2, 3, T. Tamegai4 and Franco Nori2, 5
1 Department of Physics, University of Bath - Claverton Down, Bath, BA2 7AY, UK
2 Frontier Research System, The Institute of Physical and Chemical Research (RIKEN) Wako-shi, Saitama, 351-0198, Japan
3 Department of Physics, Loughborough University - Loughborough LE11 3TU, UK
4 Department of Applied Physics, The University of Tokyo - 7-3-1 Hongo Bunkyo-ku, Tokyo - 113-8656, Japan
5 Center for Theoretical Physics, Department of Physics, University of Michigan Ann Arbor, MI, 48109-1040, USA
received 26 June 2006; accepted in final form 31 October 2006
published online 1 December 2006
We demonstrate experimentally that the micromagnetic profile of the out-of-plane component of magnetic induction of layered superconductors, Bz, can be manipulated by varying the in-plane magnetic field, . Moving Josephson vortices, confined between layers, drag pancake vortex stacks carrying out-of-plane flux, and the magnetic profile, Bz(x), can be controllably shaped across the entire sample. Depending on the magnetic history and temperature we can increase or decrease the out-of-plane flux density at the center and near the edges of the crystal by as much as ~ 40%, realising both "convex and concave magnetic flux lenses". Our experimental results are well described by molecular dynamics simulations.
74.25.Qt - Vortex lattices, flux pinning, flux creep.
74.72.Hs - Bi-based cuprates.
© EDP Sciences 2006