Abstract
Enhancement of Flux Pinning in the Superconductor–Ferromagnet Bilayer Nb(Co/Pd) Y. Syryanyy, L.Y. Zhu, M.Z. Cieplak and C.L. Chien Institute of Physics, Polish Academy of Sciences, al. Lotnikow 32/46, 02-668 Warsaw, Poland Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA The magnetometry and the magnetic force microscopy are used to study the influence of the magnetic domain size on the flux pinning in a superconducting/ferromagnetic bilayer (SFB), in which the S layer is niobium and the F layer is a Co/Pd multilayer with perpendicular magnetic anisotropy. The domain size is pre-defined using the angle-dependent demagnetization. The enhancement of pinning is found to be the strongest, up to a factor of 6, for narrow domains and small magnetic fields. This result differs from the behavior observed in the SFB in which the F layer is Co/Pt. The difference may be attributed to the degree of the disorder in the domain pattern.
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