Low-field magnetoresistance in a nanopatterned manganite track

Abstract We report on the definition of tracks with ∼50-nm wide nanoconstrictions in a manganite epitaxial film, by high-resolution electron beam lithography and ion beam etching. Magnetotransport measurements at low temperature indicate a linear high-field magnetoresistance, with symmetric resistance jumps (1–3%) visible in the 500 Oe range. We discuss the origin of this effect in terms of domain-wall scattering in manganites.