Giant Magnetoresistance in Granular Perovskite La0.8Sr0.2MnO3
ZHANG Ning1,2, DING Wei-ping1, GUO Zai-bin1, ZHONG Wei1, DU Kai-he2, DU You-wei1
1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
2Key Laboratory of Jiangsu Province for Optic and Electric Techniques, Nanjing Normal University, Nanjing 210024
Giant Magnetoresistance in Granular Perovskite La0.8Sr0.2MnO3
1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
2Key Laboratory of Jiangsu Province for Optic and Electric Techniques, Nanjing Normal University, Nanjing 210024
Abstract： The electric and magnetic properties in granular perovskite La0.8Sr0.2MnO3 have been investigated. A giant magnetoresistance (GMR) has been observed at temperatures well below TC, the Curie temperature, associated with crystal intrinsic magnetic properties. The granular GMR effect is also isotropic but shows some characteristics different from those in the films and crystals of similar perovskites. This suggests an effect of interfacial spin-dependent tunneling in the granular perovskite at temperatures much lower than TC. In addition, with the reduction of grain size, an evident superparamagnetic behavior has been observed.
1997, Vol. 14 
