Asymmetry reversal of thermomagnetic avalanches in Pb films with a ratchet pinning potential | Zendy

Mariela Menghini | Zendy; Joris Van de Vondel | Zendy; Diana G. Gheorghe | Zendy; R. J. Wijngaarden | Zendy; V. V. Moshchalkov | Zendy

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Asymmetry reversal of thermomagnetic avalanches in Pb films with a ratchet pinning potential

Author(s) -

Mariela Menghini,

Joris Van de Vondel,

Diana G. Gheorghe,

R. J. Wijngaarden,

V. V. Moshchalkov

Publication year - 2007

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.76.184515

Subject(s) - thermomagnetic convection , condensed matter physics , vortex , ratchet effect , ratchet , pinning force , asymmetry , anisotropy , magnetic field , flux pinning , superconductivity , materials science , physics , magnetic flux , lattice (music) , critical current , optics , mechanics , acoustics , thermodynamics , work (physics) , quantum mechanics

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.status: publishe

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