Electrical and magneto-transport properties of ferromagnet/superconductor/ferromagnet based heterostructure

La0.7Sr0.3MnO3/YBa2Cu3O7/La0.7Sr0.3MnO3 (LSMO/YBCO/LSMO) heterostructures were prepared by pulsed laser deposition technique. The resistivity-temperature (ρ-T) variation and magnetoresistance effects of these heterostructures have been studied and are found to be dependent on the thickness of superconducting spacer layer. We have observed that metal-insulator (TMI) transition get suppressed with increase in thickness of the spacer layer. The maximum magnetoresistance ratio ∼70% at 266 K and ∼65% at 254 K temperature are observed for 50 nm and 100 nm spacer layers respectively. In LSMO(200 nm)/YBCO(50 nm)/LSMO(200 nm) specimen the temperature coefficient of resistance (TCR) is ∼6.63% K−1 which can be useful for bolometric performances and temperature sensors.