Abstract
La0.7Ba0.3MnO3 (LBMO) thin films known to colossal magnetoresistance were deposited for uncooled infrared bolometers. The optimum oxygen pressure was examined in the process of the laser ablated LBMO films, and films were deposited on SrTiO3 (100), LaAlO3 (100) and MgO (100) substrates under the optimum oxygen pressure. The lattice mismatch between these substrates and LBMO films changed the surface structure of films. In X-ray diffraction and atomic force microscope, the LBMO film deposited on SrTiO3 (the LBMO/STO film) showed a high orientation for the substrate, and the grain growth of the LBMO/STO film was progressed. The temperature dependence of resistivity has a good agreement with that of LBMO bulk. In the near-room temperature, the LBMO/STO film showed a high TCR value, about 4%/K. Moreover, TCR values of the LBMO/STO film were over 2%/K from 300K to 335K. On the other hand, LBMO films deposited on LaAlO3 and MgO substrates, having large substrate-film lattice mismatches, showed a low TCR value, below 2%/K, in the near-room temperature.
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