title: Exchange bias in Fe@Cr core-shell nanoparticles.
abstract: We have used X-ray magnetic circular dichroism and magnetometry to study isolated Fe@Cr core-shell nanoparticles with an Fe core diameter of 2.7 nm (850 atoms) and a Cr shell thickness varying between 1 and 2 monolayers. The addition of Cr shells significantly reduces the spin moment but does not change the orbital moment. At least two Cr atomic layers are required to stabilize a ferromagnetic/antiferromagnetic interface and generate the associated exchange bias and increase in coercivity.
authors.affiliation: Department of Physics and Astronomy, University of Leicester , Leicester LE1 7RH, United Kingdom.
authors.forename: Chris
authors.initials: C
authors.lastname: Binns
authors.forename: Muhammad T
authors.initials: MT
authors.lastname: Qureshi
authors.forename: Davide
authors.initials: D
authors.lastname: Peddis
authors.forename: Stephen H
authors.initials: SH
authors.lastname: Baker
authors.forename: Paul B
authors.initials: PB
authors.lastname: Howes
authors.forename: Adrian
authors.initials: A
authors.lastname: Boatwright
authors.forename: Stuart A
authors.initials: SA
authors.lastname: Cavill
authors.forename: Sarnjeet S
authors.initials: SS
authors.lastname: Dhesi
authors.forename: Leonardo
authors.initials: L
authors.lastname: Lari
authors.forename: Roland
authors.initials: R
authors.lastname: Kröger
authors.forename: Sean
authors.initials: S
authors.lastname: Langridge