Issue
Europhys. Lett.
Volume 76, Number 6, December 2006
Page(s) 1151 - 1157
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI http://dx.doi.org/10.1209/epl/i2006-10411-3
Published online 01 December 2006
Europhys. Lett., 76 (6), pp. 1151-1157 (2006)
DOI: 10.1209/epl/i2006-10411-3

Manipulation of magnetic-flux landscapes in superconducting $\chem{Bi_2Sr_2CaCu_2O_{8+\delta}}$ crystals

D. 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

Abstract
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, $H_{\parallel}$. 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.

PACS
74.25.Qt - Vortex lattices, flux pinning, flux creep.
74.72.Hs - Bi-based cuprates.

© EDP Sciences 2006