Structure, morphology and magneto-transport properties of laser ablated La0.85Te0.15MnO3 thin film on LaAlO3

2^nd International Conference and Exhibition on Materials Science & Engineering

October 07-09, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

Irshad Bhat

Accepted Abstracts: J Material Sci

Abstract :

The colossal magneto resistance (CMR) effect and associated exotic physical properties exhibited in various electron doped pervoskite manganites have been the subject of extensive research. In this class of manganites, the electron is the majority charge carriers. Such materials exhibit a significant value of CMR that is associated with the mixed-valence state of Mn 3+ -Mn 2+ . This property has made them promising as magnetic field sensors, as the elements in magnetic random access memories, for infrared detector applications and as elements in spintronic devices. We report the structural, morphological and magneto-transport properties of pervoskite oxide La0.85Te0.15MnO 3 thin film grown on (001) LaAlO 3 single crystal substrate by pulsed laser deposition. X-ray diffraction (XRD) results confirming that the film has good crystalline quality, single phase, and c-axis orientation. The atomic force microscopic (AFM) results shows that the film consist of grains with a diameter in the range of 20-30 nm, with a root-mean square (rms) roughness of 0.07 nm. The resistivity measurement showed an insulator to metal transition (MIT).Very huge MR (%) of the order of about (93%) close to MIT at 8T of field is noticed. X-ray photoemission spectroscopy confirms the electron doping and suggests that Te ions could be in the Te 4+ state, while the Mn ions stays in the Mn 2+ and Mn 3+ valence state.

Biography :

Irshad Bhat is a graduate student having four years of experience in research (Ph.D. program). His main interest covers several problems related to strongly correlated electron systems. The main topic of his research is electron doped manganites that includes metal-insulator transition in oxides and colossal magneto-resistance. His research activities encompass synthesis of materials of different kinds, fabrication of nano composites and physical measurements done down to low temperatures in high magnetic fields using a variety of techniques. His work has been published in several reputed Journals. His current research mainly focuses on thin films of manganites and their characterizations.