不同衬底对La0.7Sr0.3MnO3薄膜物理性能的影响研究
Effect of Different Substrates on Physics Properties of La0.7Sr0.3MnO3 Thin Films
DOI: 10.12677/MS.2021.112021, PDF,    国家自然科学基金支持
作者: 张裕祥, 叶晴莹, 王 可, 霍冠忠, 陈水源*：福建师范大学物理与能源学院，福建 福州；福建省量子调控与新能源材料重点实验室，福建 福州；叶 颖, 林文青：福建师范大学物理与能源学院，福建 福州
关键词: 脉冲激光沉积；La0.7Sr0.3MnO3薄膜；衬底；磁特性；磁电阻；Pulsed Laser Deposition； La0.7Sr0.3MnO3 Thin Films； Substrates； Magnetic Properties； Magnetore-sistance
摘要: 本论文利用脉冲激光沉积法在普通玻璃、SrTiO3(100)单晶衬底上分别制备得到La0.7Sr0.3MnO3/SiO2和La0.7Sr0.3MnO3/SrTiO3(100)薄膜，研究衬底对La0.7Sr0.3MnO3物理特性的影响。实验结果表明：在普通玻璃衬底上制备得到纯相多晶LSMO薄膜，在SrTiO3(100)单晶衬底上制备得到具有外延取向生长的LSMO薄膜；在磁性方面，La0.7Sr0.3MnO3/SiO2薄膜的居里温度(Tc)低于LSMO/SrTiO3(100)薄膜。在Tc以下，LSMO/SiO2薄膜的矫顽力和磁化磁强度均大于LSMO/SrTiO3(100)薄膜；在电性方面，两个样品的电阻率温度曲线存在明显区别：LSMO/SiO2薄膜存在两个转变点，并且在整个测量温区(5~400 K)均表现出明显的磁电阻效应，最大磁电阻值达到−98%；对于LSMO/SrTiO3(100)样品，电阻率温度曲线中仅在高温区(350 K附近)存在一个转变点。且仅在M-I转变温度附近有明显的磁电阻现象，最大磁电阻值为−53.12%。从以上研究结果可以看出，不同衬底条件对LSMO薄膜的微结构有明显影响，进而对其磁性、磁电阻特性产生调制作用。这一结果在钙钛矿锰氧化物复合结构材料物理特性调制研究以及在自旋电子器件中的应用研究具有很好的参考意义。
Abstract: In this paper, La0.7Sr0.3MnO3/SiO2 (abbreviated as LSMO/SiO2) and La0.7Sr0.3MnO3/SrTiO3(100) (abbreviated as LSMO/STO) thin films were prepared by pulsed laser deposition method. The ex-perimental results show that the two thin films present very different magnetic properties. The LSMO/SiO2 film shows obvious magnetoresistance (MR) effect in the whole measurement temper-ature range (5 K~400 K), and the maximum MR value up to −98% is obtained. However, the MR of LSMO/STO samples is obvious only near the M-I transition temperature, and the maximum MR value is up to −53.12%. These results indicate that different substrates have significant effect on the magnetic and MR properties of the LSMO films. It has good reference significance for further research on the modulation research of physical properties of LSMO-based composites and its ap-plication in spintronic devices.
文章引用：张裕祥, 叶颖, 叶晴莹, 王可, 霍冠忠, 林文青, 陈水源. 不同衬底对La0.7Sr0.3MnO3薄膜物理性能的影响研究[J]. 材料科学, 2021, 11(2): 160-167. https://doi.org/10.12677/MS.2021.112021

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