Elaboration of Nanomagnet Arrays: Organization and Magnetic Properties of Mass-Selected FePt Nanoparticles Deposited on Epitaxially Grown Graphene on Ir(111)

The moiré pattern created by the epitaxy of a graphene sheet on an iridium substrate can be used as a template for the growth of 2D atomic or cluster arrays. We observed for the first time a coherent organization of hard magnetic preformed FePt nanoparticles on the 2D lattice of graphene on Ir(111)....

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Bibliographic Details
Published in:Physical review letters 2019-03, Vol.122 (10), p.106802-106802, Article 106802
Main Authors: Capiod, Pierre, Bardotti, Laurent, Tamion, Alexandre, Boisron, Olivier, Albin, Clément, Dupuis, Véronique, Renaud, Gilles, Ohresser, Philippe, Tournus, Florent
Format: Article
Language:English
Subjects:
Clusters
Condensed Matter
Dichroism
Epitaxial growth
Graphene
Intermetallic compounds
Iridium
Iron compounds
Magnetic properties
Morphology
Nanoparticles
Physics
Platinum compounds
Small angle X ray scattering
Substrates
Vapor phases
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Summary:The moiré pattern created by the epitaxy of a graphene sheet on an iridium substrate can be used as a template for the growth of 2D atomic or cluster arrays. We observed for the first time a coherent organization of hard magnetic preformed FePt nanoparticles on the 2D lattice of graphene on Ir(111). Nanoparticles of 2 nm diameter have been mass selected in a gas phase and deposited with low energy on the hexagonal moiré pattern. Their morphology and organization have been investigated using grazing incidence small angle x-ray scattering, while their magnetic properties have been studied by x-ray magnetic circular dichroism, both pointing to a FePt cluster-graphene surface specific interaction. The spatial coherence of the nanoparticles is preserved upon annealing up to 700 °C where the hard magnetic phase of FePt is obtained.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.106802