Title: Vortex ratchet effects in films with a periodic array of antidots
Authors: de Souza Silva, CC ×
Van de Vondel, Joris
Zhu, BY
Morelle, Mathieu
Moshchalkov, Victor #
Issue Date: Jan-2006
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:73 issue:1 pages:1-10
Article number: 014507
Abstract: The vortex ratchet effect has been studied in Al films patterned with square arrays of submicron antidots. We have investigated the transport properties of two sets of samples: (i) asymmetrical antidots where vortices are driven by an unbiased ac current and (ii) symmetrical antidots where in addition to the ac drive a dc bias was used. For each sample, the rectified dc voltage is measured as a function of drive amplitude and frequency, magnetic field, and temperature. As unambiguously shown by our data, the voltage rectification in the asymmetric antidots is induced by the intrinsic asymmetry in the pinning potential created by the antidots, whereas the rectification in the symmetric antidots is induced by the dc bias. In addition, the experiments reveal interesting collective phenomena in the vortex ratchet effect. At fields below the first matching field (H-1), the dc-voltage-ac-drive characteristics present two rectification peaks, which is interpreted as an interplay between the one-dimensional motion of weakly pinned incommensurate vortex rows and the two-dimensional motion of the whole vortex lattice. We also discuss the different dynamical regimes controlling the motion of interstitial and trapped vortices at fields higher than H-1 and their implications for the vortex ratchet effect.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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