Rocking ratchet induced by pure magnetic potentials with broken reflection symmetry



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Perez de Lara, David and Castaño, F. J. and Ng,, B. G. and Korner, H. S. and Dumas, R. K. and González Herrera, Elvira María and Liu, Kai and Ross,, C. A. and Schuller, Ivan K. and Vicent López, José Luis (2009) Rocking ratchet induced by pure magnetic potentials with broken reflection symmetry. Physical review B, 80 (22). ISSN 1098-0121

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A ratchet effect (the rectification of an ac injected current) which is purely magnetic in origin has been observed in a superconducting-magnetic nanostructure hybrid. The hybrid consists of a superconducting Nb film in contact with an array of nanoscale magnetic triangles, circular rings, or elliptical rings. The arrays were placed into well-defined remanent magnetic states by application of different magnetic field cycles. The stray fields from these remanent states provide a magnetic landscape which influences the motion of superconducting vortices. We examined both randomly varying landscapes from demagnetized samples and ordered landscapes from samples at remanence after saturation in which the magnetic rings form parallel onion states containing two domain walls. The ratchet effect is absent if the rings are in the demagnetized state or if the vortices propagate parallel to the magnetic reflection symmetry axis (perpendicular to the magnetic domain walls) in the ordered onion state. On the other hand, when the vortices move perpendicular to the magnetic reflection symmetry axis in the ordered onion state (parallel to the domain walls) a clear ratchet effect is observed. This behavior differs qualitatively from that observed in samples containing arrays of triangular Ni nanostructures, which show a ratchet of structural origin.

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©2009 The American Physical Society.
This work has been supported by Spanish Ministerio Ciencia e Innovacion, Grants No. NAN2004-09087, No. FIS2005-07392, Consolider No. CSD2007-00010, and No.
FIS2008-06249 Grupo Consolidado, and CAM under Grant No. S-0505/ESP/0337, Fondo Social Europeo, CITRIS, the U.S. National Science Foundation, and the INDEX program of the Nanoelectronics Research Institute. I.K.S. acknowledges support from UCM and Banco Santander during his sabbatical stay in Universidad Complutense at Madrid.

Uncontrolled Keywords:Superconductors; Vortices
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:43176
Deposited On:21 Jun 2017 14:33
Last Modified:22 Jun 2017 07:51

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