论文部分内容阅读
采用溶胶-凝胶旋涂法在(111)掺钇氧化锆(YSZ)基片上制备了多铁性YFeO_3薄膜,并用X射线衍射仪、原子力显微镜、紫外-可见分光光度计及磁性测量系统,研究了退火温度对YFeO_3薄膜的微观结构、光学和磁学性能的影响。结果表明:YFeO_3薄膜具有正交钙钛矿的多晶结构,退火温度高于1123K时,薄膜产生了(002)、(311)面的择优取向生长;但当退火温度提高至1 223 K时,由于再结晶,薄膜晶粒尺寸及表面粗糙度显著增大;YFeO_3薄膜在可见光区具有明显的光响应性能,其带隙约为2.21~2.29eV;同时YFeO_3薄膜具有室温铁磁性,提高退火温度,样品磁化强度变大,而矫顽力减小。
The multiferroic YFeO_3 thin films were prepared on sol-gel spin-on (YSZ) substrates using X-ray diffractometer, atomic force microscopy, UV-visible spectrophotometer and magnetic measurement system Effect of Annealing Temperature on Microstructure, Optical and Magnetic Properties of YFeO_3 Thin Films. The results show that the YFeO_3 thin films have the polycrystalline structure of orthorhombic perovskite. When the annealing temperature is higher than 1123K, the (002) and (311) planes are preferentially grown. However, when the annealing temperature is increased to 1 223 K, Due to the recrystallization, the grain size and the surface roughness of the YFeO_3 thin films increase obviously. The YFeO_3 thin films have obvious photoresponsive properties in the visible region with a bandgap of about 2.21 ~ 2.29eV. Meanwhile, the YFeO_3 thin films have room-temperature ferromagnetism and improve the annealing temperature, The sample magnetization becomes larger and the coercive force decreases.