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Cr(Mn)xFe3-xO4/ZnO复合薄膜的磁性和输运特性研究
发表时间：2015-12-15 浏览量：1761 下载量：594
| 全部作者： | 李鹏，崔文瑶，白海力 |
| 作者单位： | 天津大学理学院 |
| 摘 要： | 采用反应磁控溅射法在蓝宝石c-Al2O3基底上制备了全外延Cr(Mn)xFe3–xO4/ZnO异质结构。使用X射线衍射（X-ray diffraction，XRD）、扫描电子显微镜（scanning electronic microscope，SEM）、X射线光电子能谱（X-ray photoelectron spectroscopy，XPS）等手段对样品的微观结构进行分析。用物理性质测量系统（physical property measurement system，PPMS）测量样品的电输运特性。结构分析表明，Cr(Mn)xFe3–xO4为尖晶石结构，Cr(Mn)xFe3–xO4和ZnO均为外延生长，外延关系为Cr(Mn)xFe3–xO4(111)||ZnO(0002)；Cr(Mn)xFe3–xO4中不存在γ-Fe2O3相，Cr元素以+3价为主，Mn元素以+2价为主。低温下跨Cr(Mn)xFe3–xO4/ZnO异质结构界面的输运机制为热离子发射/扩散。ZnO异质结构界面处的肖特基势垒高度分别为0.362 eV（Cr）和0.360 eV（Mn）；当温度为30 K时，Cr(Mn)xFe3–xO4的自旋极化率分别为56.3%（Cr）和43.8%（Mn）. |
| 关 键 词： | 低维无机非金属材料；外延薄膜；异质结构；自旋极化率 |
| Title： | The magnetic and transport property of Cr(Mn)xFe3-xO4/ZnO composite films |
| Author： | LI Peng, CUI Wenyao, BAI Haili |
| Organization： | School of Science, Tianjin University |
| Abstract： | Fully epitaxial all oxide heterostructures Cr(Mn)xFe3–xO4/ZnO were fabricated by reactive sputtering on c-Al2O3. The microstructure and chemical component of the films were systematically investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). A quantum design physical property measurement system (PPMS) was introduced to investigate the transport properties of the samples. Structural analyses reveal that the Cr(Mn)xFe3–xO4 films have a spinel structure. The Cr(Mn)xFe3–xO4 and ZnO films on c-Al2O3 are fully epitaxial, where the epitaxial relationship is Cr(Mn)xFe3-xO4(111)||ZnO(0002). XPS shows that γ-Fe2O3 is absent in the Cr(Mn)xFe3–xO4 films, and the valences of Cr atom and Mn atom are mainly +3 and +2, respectively. The transport mechanism across the Cr(Mn)xFe3–xO4/ZnO interface is thermal emission /diffusion at low temperatures. The Schottky barriers of the ZnO based heterostructures are 0.362 eV (Cr) and 0.360 eV (Mn), respectively. The spin polarization of Cr(Mn)xFe3–xO4 at 30 K is 56.3% (Cr) and 43.8%(Mn), respectively. |
| Key words： | low-dimensional inorganic nonmetallic materials; epitaxial films; heterostructure; spin polarization |
| 发表期数： | 2015年12月第23期 |
| 引用格式： | 李鹏，崔文瑶，白海力. Cr(Mn)xFe3-xO4/ZnO复合薄膜的磁性和输运特性研究[J]. 中国科技论文在线精品论文，2015，8（23）：2474-2481. |
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