Highly sensitive low-temperature low-field colossal magnetoresistance in screen printed La0.63Y0.07 Ca0.30MnO3 thick films

Thick films of La0.63Y0.07Cao.30MnO3 were fabricated on (100) oriented single crystal LaAlO3 (LAO) and on polycrystalline Al2O3 substrates by a screen printing technique. The films were sintered at 1200°C in air and oxygen atmosphere. All these thick films show a metal-insulator (M-I) transition at Tp1∼220 K. For both substrates, the films sintered in oxygen flow have slightly higher Tp1. The film on polycrystalline Al2O3 sintered in oxygen flow shows 71% magnetoresistance (MR) at 220 K in the presence of an 8 T applied field. The salient feature of the colossal magnetoresistance observed in these thick films is that low-temperature low-field MR is highly sensitive than only Ca doped manganites.