Publication: Vortex ratchet reversal: Role of interstitial vortices
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Publication Date
2011-05-09
Authors
Pérez de Lara, David
Erekhinsky, M.
Rosen, Y. J.
Schuller, Ivan K.
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American Physical Society
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Abstract
Triangular arrays of Ni nanotriangles embedded in superconducting Nb films exhibit unexpected dynamical vortex effects. Collective pinning with a vortex-lattice configuration different from the expected fundamental triangular "Abrikosov state" is found. The vortex motion, which prevails against the triangular periodic potential, is produced by channeling effects between triangles. Interstitial vortices coexisting with pinned vortices in this asymmetric potential lead to ratchet reversal, i.e., a dc output voltage that changes sign with the amplitude of an applied alternating drive current. In this landscape, ratchet reversal is always observed at all magnetic fields (all numbers of vortices) and at different temperatures. The ratchet reversal is unambiguously connected to the presence of two locations for the vortices: interstitial and above the artificial pinning sites.
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©2011 American Physical Society.
Research at UCSD was funded by the US-NSF and support at UCM was provided by Spanish Ministerio Ciencia e Innovacion Grant No. FIS2008-06249 (Grupo Consolidado), Consolider CSD2007-00010, CAM Grant No. S2009/MAT-1726, and Santander-UCM Grant No. GR35/10-A, Imdeananoscience. We Thank S. Bar-Ad And Y. Bruynseraede For Useful Conversations.