Target effects on electrical properties and laser induced voltages of La_(0.72)Ca_(0.28)MnO_3 thin films prepared by pulsed laser deposition  

脉冲激光沉积镀膜工艺中不同靶材制备方法对La_(0.72)Ca_(0.28)MnO_3薄膜电学性能和激光感生电压的影响（英文）

作　　者：张辉[1] 王文章[1] 崔琦[1] 业冬[1] 马吉[1] 陈清明[1] 刘翔[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第2期465-470,共6页中国有色金属学报（英文版）

基　　金：Project(50902062)supported by the National Natural Science Foundation of China;Project(KKZ1200927002)supported by Key Programme of Kunming University of Science and Technology,China

摘　　要：La0.72Ca0.28MnO3 thin films were deposited on untilted and 15° tilted LaAlO_3 （100） single crystalline substrates by pulsed laser deposition. The polycrystalline targets used in the deposition process were synthesized by sol-gel and coprecipitation methods, respectively. The structure, electrical transport properties and surface morphology of the targets and films were studied. It is found that, compared with coprecipitation method, the sol-gel target has more homogeneous components and larger density and grain size, thus the higher insulator-metal transition temperature and larger temperature coefficient of resistivity. The thin film prepared by sol-gel target has a uniform grain size and higher quality. The metal-insulator transition temperature is higher and the laser induced voltage signal is larger. Preparing the target by sol-gel method can largely improve the properties of corresponding thin films in pulsed laser deposition process.采用脉冲激光沉积方法在单晶LaAlO3(100)平衬底和15°倾斜衬底上制备La0.72Ca0.28MnO3薄膜。在镀膜过程中分别采用溶胶-凝胶法和共沉淀法制备靶材。研究不同方法制备的靶材和相应的薄膜的结构、电输运性能和表面形貌。与共沉淀法相比,采用溶胶-凝胶法制备的靶材具有更加均匀的组分和更大的致密度以及晶粒尺寸,因此具有更高的绝缘体-金属转变温度和更大的电阻温度系数。采用溶胶-凝胶靶材制备的薄膜,其晶粒尺寸更均匀、生长质量更好,绝缘体-金属转变温度高20 K,激光感生电压也更大。因此,使用溶胶-凝胶方法制备靶材可以大幅提高脉冲激光沉积方法中薄膜的性能。

关 键 词：La0.72Ca0.28MnO3 TARGET thin film sol-gel method coprecipitation method 

分 类 号：TB306[一般工业技术—材料科学与工程] TB383.2