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Vortex ratchet reversal at fractional matching fields in kagomelike array with symmetric pinning centers

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Perez de Lara, D. y Alija, A. y González Herrera, Elvira María y Velez, M. y Martin, J. I. y Vicent López, José Luis (2010) Vortex ratchet reversal at fractional matching fields in kagomelike array with symmetric pinning centers. Physical review B, 81 (5). ISSN 1098-0121

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URL Oficial: http://dx.doi.org/10.1103/PhysRevB.82.174503


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Resumen

Arrays of Ni nanodots embedded in Nb superconducting films have been fabricated by sputtering and electron-beam lithography techniques. The arrays are periodic triangular lattices of circular Ni dots arranged in a kagomélike pattern with broken reflection symmetry. Relevant behaviors are found in the vortex lattice dynamics: i at values lower than the first integer matching field, several fractional matching fields are present when the vortex lattice moves parallel or perpendicular to the reflection symmetry axis of the array showing a clear anisotropic character in the magnetoresistance curves, ii injecting an ac perpendicular to the reflection symmetry axis of the array yields an unidirectional motion of the vortex lattice ratchet effect as a result of the interaction between the whole vortex lattice and the asymmetric lattice of dots, iii increasing the input current amplitudes the ratchet effect changes polarity independently of matching field values. These experimental results can be explained taking into account the vortex lattice density.


Tipo de documento:Artículo
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©2010 The American Physical Society.
We want to thank useful conversations with Ivan K. Schuller. We want to acknowledge the support by Spanish Ministerio Ciencia e Innovación under Grants No. FIS2008- 06249 Grupo Consolidado, Consolider No. CSD2007- 00010, and No. HP2008-0032, CAM under Grant No. S2009/MAT-1726, Santander-UCM under Grant No. GR58/ 08, Principado de Asturias FICYT under Grant No. IB08- 106, and IMDEA-Nanoscience.

Palabras clave:Regular array; Magnetic dots; Films; Lattice
Materias:Ciencias > Física > Física de materiales
Ciencias > Física > Física del estado sólido
Código ID:43158
Depositado:16 Jun 2017 18:39
Última Modificación:19 Jun 2017 07:59

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