title: Magnetoresistance effect in (La, Sr)MnO3 bicrystalline films.
abstract: The angular dependence of the magnetoresistance effect has been measured on bicrystalline La(0.75)Sr(0.25)MnO(3) films. The measurements have been performed on an electronically lithographed Wheatstone bridge. The study of the angular dependence of both the magnetoresistance and the resistance of single-crystalline and grain-boundary regions of the samples allowed us to isolate two contributions of low-field magnetoresistance in manganites. One of them is associated with the spin-orbit effect, i.e. the anisotropic magnetoresistance of ferromagnetic compounds, and the other one is related to spin-disorder regions at the grain boundary. Complementary x-ray diffraction, ferromagnetic resonance and low temperature magnetization experiments contribute to the characterization of the magnetic anisotropy of the samples and the general comprehension of the problem.
authors.affiliation: Centro Atómico Bariloche (CNEA), San Carlos de Bariloche, Pcia. de Río Negro, Argentina. galejand@cab.cnea.gov.ar
authors.forename: G
authors.initials: G
authors.lastname: Alejandro
authors.forename: L B
authors.initials: LB
authors.lastname: Steren
authors.forename: H
authors.initials: H
authors.lastname: Pastoriza
authors.forename: D
authors.initials: D
authors.lastname: Vega
authors.forename: M
authors.initials: M
authors.lastname: Granada
authors.forename: J C Rojas
authors.initials: JC
authors.lastname: Sánchez
authors.forename: M
authors.initials: M
authors.lastname: Sirena
authors.forename: B
authors.initials: B
authors.lastname: Alascio