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Vortex ratchet reversal: Role of interstitial vortices

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Pérez de Lara, David and Erekhinsky, M. and González Herrera, Elvira María and Rosen, Y. J. and Schuller, Ivan K. and Vicent López, José Luis (2011) Vortex ratchet reversal: Role of interstitial vortices. Physical review B, 83 (17). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.83.174507


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https://journals.aps.orgUNSPECIFIED


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.


Item Type:Article
Additional Information:

©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.

Uncontrolled Keywords:Transport; Physics, Condensed Matter
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:43131
Deposited On:22 Aug 2017 17:10
Last Modified:23 Aug 2017 07:26

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