超巨磁电阻薄膜在光探测上的新应用  

New applications of colossal magnetoresistance thin film materials in photodetection

作　　者：常雷[1] 蒋毅坚[2] 王茺[1] 朱绍将[1] 张国勇[1] 张鹏翔[1] 

机构地区：[1]昆明理工大学光电子新材料研究所,昆明650051 [2]北京工业大学国家产学研激光技术中心,北京100022

出　　处：《物理》2004年第5期367-371,共5页Physics

基　　金：国家自然科学基金 (批准号 :10 2 740 2 6);云南省科委 (批准号 :1999E0 0 0 3Z)资助项目

摘　　要：混合价态钙钛矿锰氧化物在外界温度变化和磁场作用下表现出巨大的磁电阻 (colossalmagnetoresistance,简记为CMR)效应 ,引起了人们的广泛关注 .由于CMR材料在传感器、探测器以及硬盘读出磁头等应用器件研发上极具潜力 ,科学家们对其进行了大量研究 .文章在简单介绍CMR材料结构和机理的基础上 ,着重报道了作者利用CMR薄膜的激光感生热电电势 (LITV)制备激光功率 /能量探测器和利用电阻在室温附近的巨大变化研制光热辐射探测器 (bolometer)Much attention has been focused on mixed-valency perovskite manganites of the general formula Re 1- x M x MnO 3 (Re=rare earth, M=Ca,Ba,Sr,Pb)because they exhibit very dramatic changes in electrical resistivity, i.e. Colossal magnetoresistance(CMR), when the temperature is changed and an external magnetic field applied. Extensive studies have been conduced on these materials as they have the great potential to be used as sensors, detectors and high digital density read out heads, etc. In this paper the structure and mechanism of CMR materials are briefly presented; new applications are reported in detail, including the newly discovered laser induced thermoelectric voltage effect and the gigantic resistance variation during metal-insulator transitions.

关 键 词：超巨磁电阻薄膜 光探测器 激光感生热电势效应 能量探测器 

分 类 号：O484[理学—固体物理]