Magnetoresistance in La2/3Ca1/3MnO 3+δ: Dependence on magnetic history

Abstract

We investigated the magnetoresistance of La2/3Ca 1/3MnO3+δ magnetic thin films. Under certain conditions, the magnetoresistance curves show a remarkable hysteresis and the resistance becomes dependent on the magnetic history. A relaxation behavior of the resistance has also been observed. Hysteresis and relaxation of the resistance are very similar to the phenomena of magnetoviscosity of the magnetic moment in spin glasses and the magnetic aftereffect in hard magnets.© 1995 American Institute of Physics.