Enhancement of Flux Pinning in the Superconductor-Ferromagnet Bilayer Nb(Co/Pd)
Y. Syryanyy a, L.Y. Zhu b, M.Z. Cieplaka,b and C.L. Chien b
aInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
bDepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
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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.
DOI: 10.12693/APhysPolA.118.399
PACS numbers: 74.78.-w, 74.78.Fk, 74.25.Ha, 75.70.Kw, 75.70.-i, 75.70.Cn, 75.78.Fg