MAGNETORESISTANCE OF EPITAXIAL THIN-FILMS OF FERROMAGNETIC METALLIC OXIDE SRRUO3 WITH DIFFERENT DOMAIN-STRUCTURES

We have studied the magnetoresistive behavior of epitaxial thin films of the conductive ferromagnetic oxide SrRuO3 with different domain str uctures grown on both miscut (001) SrTiO3 and exact (001) LaAlO3 subst rates. A strong anisotropic magnetoresistance (MR) has been observed i n the single domain SrRuO3 thin film on miscut (001) SrTiO3 substrate. In contrast, the SrRuO3 thin film on (001) LaAlO3 substrate shows ide ntical MR behavior in two orthogonal directions on the film due to the presence of 90 degrees domains in the plane. For both the films, larg e negative magnetoresistance effects (similar to 10%) were observed wh en the current and the applied magnetic field are parallel. This is at tributed to a reduction in spin fluctuations near T-c and to magnetiza tion rotation leading to a change in the angle between the current and magnetization at low temperatures. (C) 1997 American Institute of Phy sics.