The Route to Supercurrent Transparent Ferromagnetic Barriers in Superconducting Matrix

[Image: see text] A ferromagnetic barrier thinner than the coherence length in high-temperature superconductors is realized in the multilayers of YBa(2)Cu(3)O(7-δ) and La(0.67)Ca(0.33)MnO(3). We used epitaxial growth of YBCO on ⟨110⟩ SrTiO(3) substrates by pulsed laser deposition to prepare thin superconducting films with copper oxide planes oriented at an angle to the substrate surface. Subsequent deposition of LCMO and finally a second YBCO layer produces a superconductor/ferromagnet/superconductor trilayer containing an ultrathin ferromagnetic barrier with sophisticated geometry at which the long axis of coherence length ovoid of YBCO is pointing across the LCMO ferromagnetic layer. A detailed characterization of this structure is achieved using high-resolution electron microscopy.