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利用脉冲激光沉积技术在LaAlO3(00l)单晶衬底上制备了La0.67Ba0.33MnO3薄膜,研究了CO2激光辐照对La0.67Ba0.33MnO3薄膜的微结构和磁电性能的影响.结果表明,经激光辐照后,La0.67Ba0.33MnO3薄膜的结晶性增强,薄膜应变减小;薄膜表面形貌由“岛状”结构变为“平原”结构,且粗糙度大大降低;同时,薄膜的饱和磁化强度、铁磁居里温度、金属—绝缘态转变温度和磁电阻增大,而矫顽场和电阻率减小.根据对传统退火效应的分析和理论计算,认为激光辐照导致的表面微结构的变化以及薄膜的氧含量和均匀性的提高对La0.67Ba0.33MnO3薄膜的磁电性能的改善与优化密切相关.
La0.67Ba0.33MnO3 thin films were prepared on LaAlO3 (00l) single crystal substrate by pulsed laser deposition technique. The effects of CO2 laser irradiation on the microstructures and magnetic properties of La0.67Ba0.33MnO3 thin films were investigated. After laser irradiation, the crystallinity of La0.67Ba0.33MnO3 film is enhanced and the film strain is decreased. The surface morphology of the film is changed from “island” structure to “plain” structure and the roughness is greatly reduced. At the same time , The saturation magnetization, the ferromagnetic Curie temperature, the metal-insulator transition temperature and the magnetoresistance increase, while the coercive field and the resistivity decrease.According to the analysis and theoretical calculation of the traditional annealing effect, it is considered that the laser irradiation The change of the surface microstructure and the improvement of the oxygen content and the uniformity of the film are closely related to the improvement and optimization of the magnetic and electrical properties of the La0.67Ba0.33MnO3 thin film.