Strong anisotrpoic maganetoresistance and magnetic interaction in La_(0.7)Ce_(0.3)MnO_3/La_(0.7)Ca_(0.3)MnO_3 p-n junction

摘要

The p-n junction made by colossal magnetoresistance materials, such as La_(0.7)Ce_(0.3)MnO_3/La_(0.7)Ca_(0.3)MnO_3, has great interest for its potential applications. However, the physics of the magnetic state and transport properties of the interface still remains open. In this article, bilayer La_(0.7)Ce_(0.3)MnO_3/La_(0.7)Ca_(0.3)MnO_3/STO films with a nearly perfect interface were studied. The p-n interface possibly becomes an antiferromagnetion-insulating layer as their parent compound, LaMnO_3, and confines the bias current flowing only on the top layer. The top and bottom layers interact with each other in a way that a strong anisotropy in magnetoresistance measurements was observed.