Role of intermediate layer for La2/3Sr1/3MnO3/SiO2/Si(100) granular thin films

Magnetotransport properties of La2/3Sr1/3MnO3 (LSMO) (1500 Angstrom)/YSZ (1 00-1500 Angstrom)/SiO2/Si (100) bilayers were investigated by low-field mag netotransport measurement at room temperature. It is observed that MR ratio of the films with a YSZ buffer layer (MR = 0.43 %) was much higher than th ose of the films without a buffer layer (MR = 0.21 %) The better results of the LSMO films with a YSZ diffusion barrier are deduced to be related to t he improvement of microstructure of the films and the reduction of the inte rface reaction between the films and SiO2/Si (100) substrates. (C) 2001 Els evier Science B.V. All rights reserved.