GROWTH AND PROPERTIES OF C-AXIS TEXTURED LA0.7SR0.3MNO3-DELTA FILMS ON SIO2 SI SUBSTRATES WITH A BI4TI3O12 TEMPLATE LAYER/

c-axis textured La0.7Sr0.3MnO3-delta (LSMO) films were fabricated on S iO2/Si(001) substrates using a Bi4Ti3O12 (BTO) template layer. Electri cal and magnetic properties of LSMO were investigated. The LSMO/BTO la yer of this structure has no in-plane alignment. Even though a ferroma gnetic transition temperature, T-C, is as high as that of the epitaxia l LSMO film (360 K), a resistivity peak temperature, T-p, is about 140 K lower than T-C. The resistivity behavior as a function of temperatu re for LSMO/BTO/SiO2/Si films is found to be dominated by grain bounda ry effects. Low field sensitive magnetoresistance which suggests spin tunneling through the grain boundaries is also observed at room temper ature. (C) 1997 American Institute of Physics.