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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:1726  下载量:583
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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