退火处理对La0.8Ba0.2MnO3薄膜的表面形貌、电学及磁学性能的影响
Effects of Annealing on the Surface Morphology, Electrical and Magnetic Properties of La0.8Ba0.2MnO3 Thin Films
DOI: 10.12677/APP.2017.74016, PDF, HTML, XML, 下载: 1,536  浏览: 4,744 
作者: 魏 杰, 王安成, 胡慧敏, 刘国珍*, 仇 杰：江苏省微纳热流技术与能源应用重点实验室，苏州科技大学，数理学院，江苏 苏州
关键词: 退火时间；锰氧化物；磁学性质；电学性质；Annealing Time； Manganite； Magnetic Properties； Electric Properties
摘要: 利用脉冲激光沉积法在SrTiO3(001)上生长了La0.8Ba0.2MnO3薄膜，我们研究了退火对其表面形貌、电学和磁学性能的影响。生长完成后，在500 mbar氧气氛中原位退火2小时可以使薄膜表面的均方根粗糙度从1.24nm减小到0.24nm。退火2小时后，薄膜的绝缘-金属相变温度增加了约100K。然而，当退火时间达到3小时，由于在晶格中掺入过量的氧，薄膜在220K以下出现其它的绝缘相。结果表明，适当的退火条件对优化脉冲激光沉积法制备的锰氧化物薄膜的表面微结构和物理性质尤为重要。
Abstract: We studies the effects of annealing on the surface morphology, electrical and magnetic properties of La0.8Ba0.2MnO3 films on SrTiO3 (001) substrates grown by pulsed laser deposition. The root- mean-square roughness of the surfaces decrease significantly from 1.24 nm for as-grown films to 0.24 nm for annealed films when the films are annealed in 500 mbar oxygen for 2h. The insulator-metal phase transition temperature increases by around 100K after 2h annealing. When the annealing time rises up to 3h, however, an additional insulating phase appears below 220 K as a result of excess oxygen incorporated in the crystal lattices. Our results indicate that appropriate post-annealing conditions are necessary to optimize the surface microstructure and physical properties of manganites, especially for films prepared by pulsed laser deposition.
文章引用：魏杰, 王安成, 胡慧敏, 刘国珍, 仇杰. 退火处理对La0.8Ba0.2MnO3薄膜的表面形貌、电学及磁学性能的影响[J]. 应用物理, 2017, 7(4): 111-117. https://doi.org/10.12677/APP.2017.74016

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