title: Ultrathin limit of exchange bias coupling at oxide multiferroic/ferromagnetic interfaces.
abstract: Exchange bias coupling at the multiferroic- ferromagnetic interface in BiFeO₃ /La₀.₇ Sr₀.₃ MnO₃ heterostructures exhibits a critical thickness for ultrathin BiFeO₃ layers of 5 unit cells (2 nm). Linear dichroism measurements demonstrate the dependence on the BiFeO₃ layer thickness with a strong reduction for ultrathin layers, indicating diminished antiferromagnetic ordering that prevents interfacial exchange bias coupling.
authors.affiliation: MESA+ Institute for Nanotechnology, University of Twente, P.O. BOX 217, 7500 AE, Enschede, The Netherlands. m.huijben@utwente.nl.
authors.forename: M
authors.initials: M
authors.lastname: Huijben
authors.forename: P
authors.initials: P
authors.lastname: Yu
authors.forename: L W
authors.initials: LW
authors.lastname: Martin
authors.forename: H J A
authors.initials: HJ
authors.lastname: Molegraaf
authors.forename: Y-H
authors.initials: YH
authors.lastname: Chu
authors.forename: M B
authors.initials: MB
authors.lastname: Holcomb
authors.forename: N
authors.initials: N
authors.lastname: Balke
authors.forename: G
authors.initials: G
authors.lastname: Rijnders
authors.forename: R
authors.initials: R
authors.lastname: Ramesh
keywords: exchange bias; ferromagnet; interface; multiferroic; oxide heterostructure