Phase Diagram and Activation Energy for Vortex Pinning in Nb/(Co,Pd) Superconductor-Ferromagnet Bilayer |
| Y. Syryanyy a, M. Aleszkiewicz a, Marta Z. Cieplak a, L.Y. Zhu 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, The Johns Hopkins University, Baltimore, MD 21218, USA |
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| Using the magnetoresistance measurements we study the phase transition line and the activation energy for vortex pinning in superconductor/ferromagnet bilayer, built of a ferromagnetic Co/Pd multilayer with perpendicular magnetic anisotropy, and a niobium film, with insulating layer in-between to eliminate proximity effect. The domain width is reversibly pre-defined using the angle-dependent demagnetization. We find that the enhancement of the activation energy for vortex pinning by magnetic domains is rather modest, by a factor of about 2.1. We attribute this to large domain width, and large dispersion of the domain width in this bilayer. |
DOI: 10.12693/APhysPolA.126.A-123 PACS numbers: 74.25.F-, 74.25.N-, 74.25.Wx, 74.62.-c, 74.70.-b, 74.78.-w, 74.78.Fk, 75.70.Kw, 75.70.-i |