The electric and magnetic properties in granular perovskite La_(0.8)Sr_(0.2)MnO_(3) have been investigated.A giant magnetoresistance(GMR)has been observed at temperatures well below TC,the Curie temperature,associated...The electric and magnetic properties in granular perovskite La_(0.8)Sr_(0.2)MnO_(3) 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 T_(C).In addition,with the reduction of grain size,an evident superparamagnetic behavior has been observed.展开更多
基金Supported by the 85-06 NMS-the '85 Climbing Program,Nano-Materials Science.
文摘The electric and magnetic properties in granular perovskite La_(0.8)Sr_(0.2)MnO_(3) 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 T_(C).In addition,with the reduction of grain size,an evident superparamagnetic behavior has been observed.
