2005/02/22 by C. Bell, Christopher Bell, R. Loloee +3 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.71.180501
5 pages, 5 figures
arxiv created 2005/02/22 · openalex publication_date 2005/05/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present the measurement of superconductor/ferromagnetic Josephson junctions, based on an epitaxial Nb bottom electrode and epitaxial Fe20Ni80 barrier. Uniform junctions have been fabricated with a barrier thicknesses in the range 2--12\phantom\rule0.3em0exnm. The maximum critical current density \ensuremath∼2.4\ifmmode±\else\textpm\fi0.2\ifmmode×\else\texttimes\fi109\phantom\rule0.3em0exAm^\ensuremath-2 was found for a device with a 3\text\ensuremath-nm-thick barrier at 4.2\phantom\rule0.3em0exK, corresponding to an average characteristic voltage ICRN\ensuremath∼16\phantom\rule0.3em0ex\ensuremathμV. The ICRN showed a nonmonotonic behavior with Fe20Ni80 thickness. The variation of the resistance of a unit area ARN, of the junctions with barrier thickness gave a Nb/Py specific interface resistance of 6.0\ifmmode±\else\textpm\fi0.5\phantom\rule0.3em0exf\ensuremathΩ\phantom\rule0.2em0exm2 and Fe20Ni80 resistivity of 174\ifmmode±\else\textpm\fi50\phantom\rule0.3em0exn\ensuremathΩ\phantom\rule0.2em0exm, consistent with other studies in polycrystalline samples.