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IOP Publishing, New Journal of Physics, 7(11), p. 073046, 2009

DOI: 10.1088/1367-2630/11/7/073046

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Transverse ratchet effect and superconducting vortices: Simulation and experiment

Journal article published in 2009 by L. Dinis, D. P. de Lara, D. Perez de Lara, E. M. Gonzalez, J. V. Anguita, J. M. R. Parrondo ORCID, J. L. Vicent
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

A transverse ratchet effect has been measured in magnetic/superconducting hybrid films fabricated by electron beam lithography and magnetron sputtering techniques. The samples are Nb films grown on top of an array of Ni nanotriangles. Injecting an ac current parallel to the triangle reflection symmetry axis yields an output dc voltage perpendicular to the current, due to a net motion of flux vortices in the superconductor. The effect is reproduced by numerical simulations of vortices as Langevin particles with realistic parameters. Simulations provide an intuitive picture of the ratchet mechanism, revealing the fundamental role played by the random intrinsic pinning of the superconductor.