Magnetic dipole induced guided vortex motion

Details Magnetic dipole induced guided vortex motion Magnetic dipole induced guided vortex motion

2008-05-19

arxiv.org/abs/0805.2857v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1063/1.2955824

We present evidence of magnetically controlled guided vortex motion in a hybrid superconductor/ferromagnet nanosystem consisting of an Al film on top of a square array of permalloy square rings. When the rings are magnetized with an in-plane external field H, an array of point-like dipoles with moments antiparallel to H, is formed. The resulting magnetic template generates a strongly anisotropic pinning potential landscape for vortices in the superconducting layer. Transport measurements show that this anisotropy is able to confine the flux motion along the high symmetry axes of the square lattice of dipoles. This guided vortex motion can be either re-routed by 90 degrees by simply changing the dipole orientation or even strongly suppressed by inducing a flux-closure magnetic state with very low stray fields in the rings.

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