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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
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 |
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Additional Information: | ©2011 American Physical Society. |
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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