VLASKO-VLASOV, V. K.; COLAUTO, F.; BUZDIN, Alexandre I.; CARMO, D.; ANDRADE, A. M. H.; OLIVEIRA, A. A. M.; ORTIZ, W. A.; ROSENMANN, D.; KWOK, W.K

doi:10.1103/PhysRevB.94.184502

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VLASKO-VLASOV, V. K.
Material Science Division [ANL] [MSD]

COLAUTO, F.
Departamento de Fisica [Sao Carlos]

BUZDIN, Alexandre I.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2016, vol. 94, n° 18, p. 184502

American Physical Society

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We study interactions of perpendicular and longitudinal magnetic fields in niobium films of different thickness in a wide range of temperatures below the superconducting transition temperature (T C). In 100-nm Nb film at all temperatures the longitudinal field H || practically does not influence the dynamics of the normal flux. However, in 200-nm Nb film, a considerable anisotropy in the vortex motion is found with advanced propagation of the normal flux along H || at T > T C /2 and the preferential jumpwise growth of the thermomagnetic flux dendrites across H || at T < T C. Appearance of the in-plane vortices and their cutting reconnection with tilted vortices induced by the normal field H ⊥ is the reason for the observed anisotropy in the thicker film. Absence of the in-plane vortices and much smaller tilt of vortices generated by H ⊥ explain the isotropic normal flux dynamics in the thinner film. Our results open an alternative way of manipulating both slow vortex motion and fast thermomagnetic avalanches.< Réduire

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Crossing fields in thin films of isotropic superconductors

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