钙钛矿La_(1-x)Zn_xMnO_3薄膜结构及巨磁电阻  

STRUCTURE AND GIANT MAGNETIC RESISTANCE OF PEROVSKITE La_(1-x)Zn_xMnO_3 THIN FILMS

作　　者：刘利民[1] 刘建[1] 金永军[2] 

机构地区：[1]内蒙古大学物理科学与技术学院,呼和浩特010021 [2]内蒙古工业大学理学院,呼和浩特010021

出　　处：《硅酸盐学报》2010年第10期1876-1881,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(60561001);教育部新世纪优秀人才计划(NCET-05-0272);内蒙古自然科学基金(200408020105);内蒙古自治区教育厅(NJ04094)资助项目

摘　　要：采用射频磁控溅射法分别在LaAlO3(LAO)(001)和SrTiO3(STO)(001)单晶基片上沉积了La1-xZnxMnO3(x=0.3,0.5,0.7)系列薄膜。通过X射线衍射,原子力显微镜,X射线光电子能谱和四探针法等分别研究了在基片LAO和基片STO上沉积的La1-xZnxMnO3薄膜的相结构、微形貌、表面化学态和磁电阻等性质。结果表明:薄膜在空气中900℃退火2h后,晶粒与基片之间形成了稳定的外延结构。La0.5Zn0.5MnO3和La0.7Zn0.3MnO3薄膜的晶粒生长良好。在温度为300K,磁场为1.5T的条件下,在LAO上沉积的La0.5Zn0.5MnO3薄膜和在STO上沉积的La0.7Zn0.3MnO3薄膜的巨磁电阻变化分别高达25%和28%。A series of La1-xZnxMnO3（x = 0.3,0.5,0.7） thin films were deposited on LaAlO3（LAO）（001） and SrTiO3（STO）（001） single crystal substrates by the radio-frequency magnetron sputtering.The phase structures,morphologies,surface chemical state and magneto-resistance of La1-xZnxMnO3 on LAO substrate and La1-xZnxMnO3 on STO substrate films were investigated by X-ray diffraction,atomic force microscopy and X-ray photoelectron spectroscopy.The results show that the films annealed at 900 ℃ for 2 h in air have stability epitaxial structure between grains and the substrate.The La0.5Zn0.5MnO3 film on LAO substrate and La0.7Zn0.3MnO3 film on STO substrate are growth well,and their giant magneto-resistance change can be as high as 25% and 28% under a temperature of 300 K and the magnetic induction of 1.5 T conditions,respectively.

关 键 词：锰酸镧锌 巨磁电阻薄膜 表面化学态 磁电阻 磁控溅射法 

分 类 号：O482.54[一般工业技术—材料科学与工程]