Strong anisotrpoic maganetoresistance and magnetic interaction in La0.7Ce0.3Mn0.3/La0.7Ca0.3MnO3 p-n junction

Abstract

The p-n junction made by colossal magnetoresistance materials, such as La0.7Ce0.3MnO3/La0.7Ca0.3MnO3, 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 La0.7Ce0.3MnO3/La0.7Ca0.3MnO3/STO films with a nearly perfect interface were studied. The p-n interface possibly becomes an antiferromagnetion-insulating layer as their parent compound, LaMnO3, 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 tin magnetoresistance measurements was observed. (c) 2005 American Institute of Physics.