| Bi0.8Ba0.2FeO3/La0.7Sr0.3MnO3异质结制备及其交换偏置效应研究 |
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| 引用本文： | 魏纪周,张铭,邓浩亮,楚上杰,杜敏永,严辉. Bi0.8Ba0.2FeO3/La0.7Sr0.3MnO3异质结制备及其交换偏置效应研究[J]. 物理学报, 2015, 64(8): 88101-088101. DOI: 10.7498/aps.64.088101 |
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| 作者姓名： | 魏纪周 张铭 邓浩亮 楚上杰 杜敏永 严辉 |
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| 作者单位： | 1. 北京工业大学材料科学与工程学院, 北京 100124;2. 天津职业技术师范大学理学院, 天津 300222 |
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| 基金项目： | 国家自然科学基金(批准号: 11174021)和北京市自然科学基金(批准号: 2122007)资助的课题. |
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| 摘 要： | 采用脉冲激光沉积方法, 通过调节激光能量、激光频率、衬底温度、氧压、靶基距等工艺参数, 在(100)取向的铝酸镧单晶衬底上制备出Bi0.8Ba0.2FeO3/La0.7Sr0.3MnO3多铁性异质结. X射线衍射图谱表明薄膜呈钙钛矿结构, 高分辨透射电镜图谱和能量色散X射线图谱表明两相界面清晰且具有良好的匹配度, 异质结呈(00l)取向性生长. 加场冷却条件下不同温度的磁滞回线(M-H)测量结果表明样品具有明显的交换偏置效应, 交换偏置场(HEB)随温度的线性变化可能与异质结界面处电子轨道的重构和界面处自旋、轨道自由度之间的复杂的相互作用有关.
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| 关 键 词： | 脉冲激光沉积 异质结 交换偏置 |
| 收稿时间： | 2014-11-05 |
Preparation and exchange bias effects of Bi0.8Ba0.2FeO3/La0.7Sr0.3MnO3 heterostructures |
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| Wei Ji-Zhou,Zhang Ming,Deng Hao-Liang,Chu Shang-Jie,Du Min-Yong,Yan Hui. Preparation and exchange bias effects of Bi0.8Ba0.2FeO3/La0.7Sr0.3MnO3 heterostructures[J]. Acta Physica Sinica, 2015, 64(8): 88101-088101. DOI: 10.7498/aps.64.088101 |
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| Authors: | Wei Ji-Zhou Zhang Ming Deng Hao-Liang Chu Shang-Jie Du Min-Yong Yan Hui |
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| Affiliation: | 1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;2. School of Science, Tianjin University of Technology and Education, Tianjin 300222, China |
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| Abstract: | Bi0.8Ba0.2FeO3/La0.7Sr0.3MnO3 multiferroic heterostructures are successfully synthesized on single crystal LaAlO3(100) substrates by pulsed laser deposition via adjusting the parameters of laser energy, laser frequency, substrate temperature, oxygen pressure, distance between substrate and target, etc. The pure phase with perovskite structure is confirmed by the X-ray diffraction measurements. Using high-resolution transmission electron microscopy and energy dispersive X-Ray spectroscopy, we find that all the layers show preferential (00l) orientation, suggesting the epitaxial growth of the multilayered structure. Isothermal (7 K) M-H curves measured on sample after cooling the sample down to lower than ± 1 T fields reveal a shift in M-H loop. The strong temperature dependence of HEB is likely to be directly related to an electronic orbital reconstruction at the interface and complex interplay between orbital and spin degrees of freedom. |
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| Keywords: | pulsed laser deposition heterostructures exchange bias |
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