Title: Asymmetry reversal of thermomagnetic avalanches in Pb films with a ratchet pinning potential
Authors: Menghini, Mariela Andrea ×
Van de Vondel, Joris
Gheorghe, D. G
Wijngaarden, R. J
Moshchalkov, Victor #
Issue Date: 19-Nov-2007
Publisher: Amer physical soc
Series Title: Physical review b vol:76 issue:18 pages:1-6
Article number: 184515
Abstract: We combine transport measurements and magneto-optical imaging in order to study vortex motion in Pb samples with a square lattice of asymmetric pinning potentials formed by two antidots of different sizes. Near the boundary with the normal phase, a vortex ratchet effect is detected when an ac-current is applied. As previously observed in similar systems, inversion of vortex rectification direction occurs as the magnetic field is changed. Further inside the superconducting phase, anisotropic flux penetration patterns are formed. An inversion of anisotropy is observed as the temperature is lowered. This effect can be understood in terms of a thermomagnetic avalanche model.
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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