Vortex Self-Organization in the Presence of Magnetic Pinning Arrays |
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Authors: | M. J. Van Bael, L. Van Look, M. Lange, K. Temst, G. Gü ntherodt, V. V. Moshchalkov Y. Bruynseraede |
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Affiliation: | (1) Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;(2) II. Physikalisches Institut, RWTH Aachen, D-52056 Aachen, Germany |
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Abstract: | Lateral nanostructuring is an efficient tool to control vortex confinement in superconductors. This will be illustrated by studying pinning phenomena in type-II superconducting Pb films with a lattice of submicron magnetic dots. We consider rectangular Co dots with in-plane magnetization and circular Co/Pt dots with out-of-plane magnetization. The domain structure of the Co dots can be changed from multi- to single-domain, resulting in an enhancement of their stray field. After covering this Co dot array with a Pb film, we demonstrate the influence of the local magnetic stray field of the dots on their flux pinning efficiency. The Co/Pt dots have a single-domain structure with their magnetic moment out of plane. Depending on the magnetic history, the magnetic moment of all dots can be aligned in positive or negative direction, or a random distribution of positive and negative magnetic moments of the dots can be achieved. For a Pb film covering this Co/Pt dot array, we observe an asymmetric magnetization loop due to the magnetic interactions between the vortices and the magnetic dots. |
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Keywords: | superconductivity nanostructures magnetic dots pinning artificial pinning arrays |
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