RT Journal Article
T1 Vortex ratchet reversal at fractional matching fields in kagomelike array with symmetric pinning centers
A1 Perez de Lara, D.
A1 Alija, A.
A1 González Herrera, Elvira María
A1 Velez, M.
A1 Martin, J. I.
A1 Vicent López, José Luis
AB 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.
PB American Physical Society
SN 1098-0121
YR 2010
FD 2010-11-03
LK https://hdl.handle.net/20.500.14352/42677
UL https://hdl.handle.net/20.500.14352/42677
LA eng
NO ©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.
NO Ministerio de Ciencia e Innovación (MICINN)
NO Comunidad de Madrid
NO Universidad Complutense de Madrid/Banco de Santander
NO Consolider
NO Principado de Asturias FICYT
NO IMDEA-Nanoscience
DS Docta Complutense
RD 21 abr 2025