title: Effect of interface-induced exchange fields on cuprate-manganite spin switches.
abstract: We examine the anomalous inverse spin switch behavior in La0.7Ca0.3MnO3(LCMO)/YBa2Cu3O7-δ (YBCO)/LCMO trilayers by combined transport studies and polarized neutron reflectometry. Measuring magnetization profiles and magnetoresistance in an in-plane rotating magnetic field, we prove that, contrary to many accepted theoretical scenarios, the relative orientation between the two LCMO's magnetizations is not sufficient to determine the magnetoresistance. Rather the field dependence of magnetoresistance is explained by the interplay between the applied magnetic field and the (exponential tail of the) induced exchange field in YBCO, the latter originating from the electronic reconstruction at the LCMO/YBCO interfaces.
authors.affiliation: Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA. yhliu@anl.gov
authors.forename: Yaohua
authors.initials: Y
authors.lastname: Liu
authors.forename: C
authors.initials: C
authors.lastname: Visani
authors.forename: N M
authors.initials: NM
authors.lastname: Nemes
authors.forename: M R
authors.initials: MR
authors.lastname: Fitzsimmons
authors.forename: L Y
authors.initials: LY
authors.lastname: Zhu
authors.forename: J
authors.initials: J
authors.lastname: Tornos
authors.forename: M
authors.initials: M
authors.lastname: Garcia-Hernandez
authors.forename: M
authors.initials: M
authors.lastname: Zhernenkov
authors.forename: A
authors.initials: A
authors.lastname: Hoffmann
authors.forename: C
authors.initials: C
authors.lastname: Leon
authors.forename: J
authors.initials: J
authors.lastname: Santamaria
authors.forename: S G E
authors.initials: SG
authors.lastname: te Velthuis