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.
Highlights
Experimental methodThe samples are superconducting/magnetic hybrids, i.e. Nb films grown on top of arrays of Ni nanotriangles, which are fabricated on Si (100) substrates
A transverse ratchet effect has been measured in magnetic/ superconducting hybrid films fabricated by electron beam lithography and magnetron sputtering techniques
The samples are superconducting/magnetic hybrids, i.e. Nb films grown on top of arrays of Ni nanotriangles, which are fabricated on Si (100) substrates
Summary
The samples are superconducting/magnetic hybrids, i.e. Nb films grown on top of arrays of Ni nanotriangles, which are fabricated on Si (100) substrates. The experimental configuration is Hall-like, the injected ac current is applied parallel to the triangle reflection symmetry axis (tip to base axis) and the output voltage is recorded perpendicular to this axis This type of measurements could yield experimental artefacts due, for instance, to misalignment of the potential contacts. Close to critical temperature [14] magnetoresistance of superconducting thin films with periodic arrays of pinning centers show minima when the vortex lattice matches the unit cell of the array [15]. This geometric matching occurs when the vortex density is an integer. We proceed to describe the numerical simulations and we discuss the results
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