Proximity and reversal magnetoresistance behaviour in the oxide heterostructure of cuprate and manganite

In this paper, the oxide bilayer and trilayer consisting of superconducting cuprate and antiferromagnetic manganite are prepared using the technique of pulsed-laser deposition. Magnetic hysteresis loops at different temperatures and magnetic fields show distinct magnetic performances due to the proximity and interplay between Meissner currents in the YBCO layer as well as the magnetic fields emerging in the antiferromagnetic manganite layer. A giant positive magnetoresistance (MR) for the trilayers is clearly demonstrated in the region of mixed vortex states near the onset temperature of the superconducting transition. It is believed that the observed positive MR should be associated with the thermally activated flux dissipation, while the spin-dependent interface scattering due to the existing proximity effect may play a more significant role.