Superconducting mesa-structures with a spin filtering manganite interlayer

We report on current transport and magnetism in hybrid superconducting mesa-structures prepared from epitaxial superconductor YBa 2 Cu 3 O 7- δ and manganite LaMnO 3 thin films. Superconducting Au-Nb bilayer was the top electrode. Measurements of magnetic resonance in heterostructure with the only Au top electrode (without Nb) showed ferromagnetic state close to Curie temperature of LaMnO 3 , 150 K. A spin filtering was revealed by measurements of tunneling magneto-resistance. Mesa-structures had no superconducting current even at reduced temperature T =300 mK and the smallest manganite interlayer thickness, d M =5.6 nm. Varying the external magnetic field | H | I | P 13 Hz/A. The impact of spin polarized current on microwave generation is discussed taking into account the asymmetry of oscillation amplitudes over the applied magnetic field.