title: Low temperature ferromagnetism in chemically ordered FeRh nanocrystals.
abstract: In sharp contrast to previous studies on FeRh bulk, thin films, and nanoparticles, we report the persistence of ferromagnetic order down to 3 K for size-selected 3.3 nm diameter nanocrystals embedded into an amorphous carbon matrix. The annealed nanoparticles have a B2 structure with alternating atomic Fe and Rh layers. X-ray magnetic dichroism and superconducting quantum interference device measurements demonstrate ferromagnetic alignment of the Fe and Rh magnetic moments of 3 and 1μ(B), respectively. The ferromagnetic order is ascribed to the finite-size induced structural relaxation observed in extended x-ray absorption spectroscopy.
authors.affiliation: Laboratoire de Physique de la Matière Condensée et Nanostructures, UMR-CNRS 5586 and Université Lyon 1, 69622 Villeurbanne cedex, France.
authors.forename: A
authors.initials: A
authors.lastname: Hillion
authors.forename: A
authors.initials: A
authors.lastname: Cavallin
authors.forename: S
authors.initials: S
authors.lastname: Vlaic
authors.forename: A
authors.initials: A
authors.lastname: Tamion
authors.forename: F
authors.initials: F
authors.lastname: Tournus
authors.forename: G
authors.initials: G
authors.lastname: Khadra
authors.forename: J
authors.initials: J
authors.lastname: Dreiser
authors.forename: C
authors.initials: C
authors.lastname: Piamonteze
authors.forename: F
authors.initials: F
authors.lastname: Nolting
authors.forename: S
authors.initials: S
authors.lastname: Rusponi
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: T J
authors.initials: TJ
authors.lastname: Konno
authors.forename: O
authors.initials: O
authors.lastname: Proux
authors.forename: V
authors.initials: V
authors.lastname: Dupuis
authors.forename: H
authors.initials: H
authors.lastname: Brune