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

D. Perez De Lara*, A. Alija, E. M. Gonzalez, M. Velez, J. I. Martin, J. L. Vicent

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

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.

Original languageEnglish
Article number174503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number17
DOIs
StatePublished - 3 Nov 2010
Externally publishedYes

Fingerprint Dive into the research topics of 'Vortex ratchet reversal at fractional matching fields in kagomélike array with symmetric pinning centers'. Together they form a unique fingerprint.

Cite this