Coupling phenomena and critical currents in superconducting/magnetic superlattices

Yvon Bruynseraede; G. Verbanck; M. J. Van Bael; K. Temst; Victor V. Moshchalkov

doi:10.1117/12.332442

9 December 1998 Coupling phenomena and critical currents in superconducting/magnetic superlattices

Yvon Bruynseraede, G. Verbanck, M. J. Van Bael, K. Temst, Victor V. Moshchalkov

Proceedings Volume 3480, Superconducting Superlattices II: Native and Artificial; (1998) https://doi.org/10.1117/12.332442
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

In order to study the interplay between superconductivity and magnetism in proximity systems, we measured the critical temperature Tc decreases continuously with increasing t_Fe up to t_F3 equals 15 angstrom. At higher t_Fe 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 H_c2(T) show that the superconducting Nb layers are already decoupled for t_Fe equals 12 angstrom; magnetization measurements however indicate that the Fe layers are only ferromagnetic for t_Fe > 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.

Citation Download Citation

Yvon Bruynseraede, G. Verbanck, M. J. Van Bael, K. Temst, and Victor V. Moshchalkov "Coupling phenomena and critical currents in superconducting/magnetic superlattices", Proc. SPIE 3480, Superconducting Superlattices II: Native and Artificial, (9 December 1998); https://doi.org/10.1117/12.332442

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