化学组成对CoAlO颗粒膜隧道磁电阻效应的影响  

Effects of Chemical Composition on Tunneling Magnetoresistance of CoAlO Granular Films

作　　者：叶超群[1] 刘路 严彪[1] 徐政[1] 

机构地区：[1]同济大学材料科学与工程学院,上海200092 [2]南阳鸭河口发电有限责任公司,南阳473000

出　　处：《同济大学学报（自然科学版）》2007年第4期519-521,536,共4页Journal of Tongji University:Natural Science

摘　　要：采用热压工艺制备-系列CoAlO的靶材，在Gatan682型PECS＋RIBE系统上，于25℃下Ar气氛中沉积到Si（100）衬底基片上，得到颗粒膜．测量了电阻和磁电阻性质，用透射电子显微镜测量样品的面内晶粒尺寸CoAlO薄膜的化学组成，用x射线光电子能谱仪测量．研究了化学组成对CoAlO颗粒膜隧道磁电阻效应的影响．结果表明，得到的颗粒膜是由2～3nm的C0氧化物分布在AlOx母相中，在室温下可显示磁性，通过ALOx阻挡层具有比较大的隧道磁电阻效应（达-6％）；随温度升高，化学组成对隧道磁电阻影响更大．A series of CoAlO target were prepared by hot pressing techniques. CoAlO granular films were deposited on Si（100）by Gatan Model 682 PECS ＋ RIBE System in Ar at 25℃. Rresistive and magnetoresistive properties were measured at room temperature. Transmission electron microscopy and X-ray photoelectron spectroscopy are also utilized to investigate the inter-grain distance and chemical states of these samples. Effects of chemical composition on tuneling magnetoresistance were studied. Based on the results,the particles of Co oxide with radius around 2-3 nm could be magnetic at room temperature and provide a large tunneling magnetoresistance of - 6 % through the AlOx barrier. Chemical composition at elevated temperatures greatly affect the tunnel magnetoresistive properties.

关 键 词：隧道磁电阻效应 渤协682型PECS+RIBE系统 化学组成 

分 类 号：O484[理学—固体物理] TB43[理学—物理]