Effective-Time of Pulsed Photothermal Heating for Polycrystalline Nucleation of Perovskite Oxide Films from an Amorphous Matrix

For making a photoinduced crystal growth method more universal, we have investigated the key parameters for polycrystalline nucleation from an amorphous matrix of LaMnO(3) with focus on the pulsed photothermal heating time under excimer laser irradiation. We have clearly demonstrated that effective annealing time (t(eff)) was very important for the crystallization under the excimer laser irradiation. The t(eff) is defined as the time in which the temperature at the film surface increases over the effective annealing temperature for the crystallization of LaMnO(3). The threshold of the t(eff) value for initial crystal nucleation was evaluated to be approximately 60 ns for this material. (C) 2009 The Japan Society of Applied Physics