Low temperature growth of La0.67Ba0.33MnO3 thin films of high quality using pulsed laser deposition assisted by CO2 laser irradiation

摘要

La0.67Ba0.33MnO3 (LBMO) thin films of high quality were successfully fabricated at low temperature (400-450 degrees C) using pulsed laser deposition assisted by CO2 laser irradiation. It is shown that, at a low deposition temperature, LBMO thin films exhibit poor crystallinity and electrical and magnetic properties. With the aid of laser irradiation, LBMO thin films are significantly improved in their structure and quality and display a resistivity maximum of 6.3m Omega cm at 304 K, a large magnetoresistance of 20% (at 300 K, H = 2T) and a ferromagnetic Curie temperature of similar to 320 K, which are close to those of the LBMO thin films deposited at 800 degrees C. The observed improvement in the properties of the LBMO thin films deposited at low temperature is inferred to be largely associated with the enhanced crystallinity of the film and a decrease in the oxygen deficiency due to laser irradiation.