Giant Magnetoresistance in La0.67Ca0.33MnO3/Alq3/Co Sandwiched-Structure Organic Spin Valves  

作　　者：庞智勇 陈延学 刘甜甜 张云鹏 解士杰 颜世申 韩圣浩 

机构地区：[1]School of Physics and Microelectronics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100

出　　处：《Chinese Physics Letters》2006年第6期1566-1569,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 60576039, and the National Key Basic Research and Development Programme of China under Grant No 2001CB610504.

摘　　要：La0.67Ca0.33MnO3/Alq3/Co sandwiched-structure organic spin valves are fabricated by vacuum thermal evaporation method. A giant magnetoresistance （GMR） of 14% is observed at low temperature lOOK. At 3OK, the magnetoresistance can increase to 50%. The large GMR of the device is attributed to the high spin polarization and low conductivity of the La0.67Ca0.33MnO3 contact. The magnetoresistance AR/R and the coercive field of the Co electrode depend strongly on temperature. The large high-field magnetoresistance reported on La0.67Sr0.33MnO3/Alq3/Co organic spin valves [Nature 427 （2004） 821] is not observed in our La0.67Ca0.33MnO3/Alq3/Co organic spin valves.La0.67Ca0.33MnO3/Alq3/Co sandwiched-structure organic spin valves are fabricated by vacuum thermal evaporation method. A giant magnetoresistance （GMR） of 14% is observed at low temperature lOOK. At 3OK, the magnetoresistance can increase to 50%. The large GMR of the device is attributed to the high spin polarization and low conductivity of the La0.67Ca0.33MnO3 contact. The magnetoresistance AR/R and the coercive field of the Co electrode depend strongly on temperature. The large high-field magnetoresistance reported on La0.67Sr0.33MnO3/Alq3/Co organic spin valves [Nature 427 （2004） 821] is not observed in our La0.67Ca0.33MnO3/Alq3/Co organic spin valves.

分 类 号：O47[理学—半导体物理]