Josephson Current in Superconductor-ferromagnet Structure with YBCO-LSMO

We have studied transport property of superconductor-ferromagnet hybridized structure in nanometer-scale processed by a focused ion beam technique. The structure was consisted of high-Tc superconductor YBa2Cu3O7-x and half metallic ferromagnet La0.7Sr0.3MnO3 thin films deposited by pulse laser deposition on SrTiO3 (100) single crystal substrates. We have measured the I-V characteristics of the sample with 400 nm ferromagnetic layer, but we could not observe the proximity effect.