Dipole-Induced Vortex Ratchets in Superconducting Films with Arrays of Micromagnets

C. C. de Souza Silva; A. V. Silhanek; J. Van de Vondel; W. Gillijns; V. Metlushko; B. Ilic; V. V. Moshchalkov

doi:10.1103/PhysRevLett.98.117005

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Dipole-Induced Vortex Ratchets in Superconducting Films with Arrays of Micromagnets

C. C. de Souza Silva, A. V. Silhanek, J. Van de Vondel, W. Gillijns, V. Metlushko, B. Ilic, V. V. Moshchalkov

DOI 10.1103/PhysRevLett.98.117005 · Physical Review Letters

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Abstract

We investigate the transport properties of superconducting films with periodic arrays of in-plane magnetized micromagnets. Two different magnetic textures are studied: a square array of magnetic bars and a close-packed array of triangular microrings. As confirmed by magnetic force microscopy imaging, the magnetic state of both systems can be adjusted to produce arrays of almost pointlike magnetic dipoles. By carrying out transport measurements with ac drive, we observed experimentally a recently predicted ratchet effect induced by the interaction between superconducting vortices and the magnetic dipoles. Moreover, we find that these magnetic textures produce vortex-antivortex patterns, which have a crucial role in the transport properties of this hybrid system.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.325	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.22	Pressure not reported	unknown