title: Enhanced interfacial magnetic coupling of Gd /Fe multilayers.
abstract: The spatial extent zeta(AFM) and strength J(AFM) of the antiferromagnetic (AFM) exchange coupling at buried Gd /Fe interfaces in ferrimagnetic [Gd(50 A)Fe(15,35 A)](15) sputtered multilayers is obtained from combined x-ray resonance magnetic reflectivity and magnetic circular dichroism measurements. zeta(AFM) is 4.1(7) A or approximately 1-2 interatomic distances in bulk Gd and Fe; J(AFM) is 1050(90) K, comparable to the ferromagnetic exchange in bulk Fe.
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: D
authors.initials: D
authors.lastname: Haskel
authors.forename: G
authors.initials: G
authors.lastname: Srajer
authors.forename: J C
authors.initials: JC
authors.lastname: Lang
authors.forename: J
authors.initials: J
authors.lastname: Pollmann
authors.forename: C S
authors.initials: CS
authors.lastname: Nelson
authors.forename: J S
authors.initials: JS
authors.lastname: Jiang
authors.forename: S D
authors.initials: SD
authors.lastname: Bader