title: Giant magnetoresistance observed in (Fe,Mn)3O4 artificial nanoconstrained structures at room temperature.
abstract: We fabricated ferromagnetic oxide (Fe,Mn)(3)O(4) (FMO) nanoconstrained structures using two different steps involving atomic force microscope lithography in combination with a pulsed laser deposition technique. The widths of three FMO nanoconstrained structures were 150, 100, and 50 nm. The I-V characteristic of the 50 nm width FMO nanoconstrained structure changed dramatically from linear to nonlinear after forming the nanoconstrained structure. The magnetoresistance also increased drastically from -0.2% to 150% at room temperature. These results indicate that well-defined complicated artificial transition metal oxide nanostructures allow the creation of huge spin response devices even at room temperature.
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Goto
authors.forename: Teruo
authors.initials: T
authors.lastname: Kanki
authors.forename: Tomoji
authors.initials: T
authors.lastname: Kawai
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Tanaka