9 December 1998 Coupling phenomena and critical currents in superconducting/magnetic superlattices
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Abstract
In order to study the interplay between superconductivity and magnetism in proximity systems, we measured the critical temperature Tc decreases continuously with increasing tFe up to tF3 equals 15 angstrom. At higher tFe values Tc suddenly drops due to a larger pair breaking effect when the Fe layers change from the nonmagnetic to the ferromagnetic to the ferromagnetic regime. Measurements of Hc2(T) show that the superconducting Nb layers are already decoupled for tFe equals 12 angstrom; magnetization measurements however indicate that the Fe layers are only ferromagnetic for tFe > 15 angstrom. Critical current measurements indicate the presence of a matching effect for fields applied parallel to the layer due to the penetration of a row of vortices in the middle of the multilayer. The interaction of flux lines with magnetic dots is studied in more detail in Pb films with a lateral superlattice of magnetic Co dots. Matching anomalies in the magnetization curves indicate the stabilization of specific stable vortex lattices at integer and rational multiples of the first matching field. The influence of the stray field of the magnetic dots on the pinning properties will be discussed.
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Yvon Bruynseraede, G. Verbanck, M. J. Van Bael, K. Temst, Victor V. Moshchalkov, "Coupling phenomena and critical currents in superconducting/magnetic superlattices", Proc. SPIE 3480, Superconducting Superlattices II: Native and Artificial, (9 December 1998); doi: 10.1117/12.332442; https://doi.org/10.1117/12.332442
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