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Complex oxides exhibit a variety of unusual physical properties, which can beused for designing novel electronic devices. Here we fabricate and studyexperimentally nano-scale Superconductor/ Ferromagnet/Superconductor junctionswith the high-Tc cuprate superconductor YBa2Cu3O7 and the colossalmagnetoresistive (CMR) manganite ferromagnets LaXMnO3 (X: Ca or Sr). Wedemonstrate that in a broad temperature range the magnetization of a manganitenanoparticle, forming the junction interface, switches abruptly in amono-domain manner. The CMR phenomenon translates the magnetization loop into ahysteretic magnetoresistance loop. The latter facilitates a memoryfunctionality of such a junction with just a single CMR ferromagnetic layer.The orientation of the magnetization (stored information) can be read out bysimply measuring the junction resistance in an applied magnetic field. The CMRfacilitates a large read-out signal in a small applied field. We argue thatsuch a simple single layer CMR junction can operate as a memory cell both inthe superconducting state at cryogenic temperatures and in the normal state upto room temperature.

YBa2Cu3O7/LaXMnO3 (X: Ca, Sr) based Superconductor/Ferromagnet/Superconductor junctions with memory functionality