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Title: Using graphene to control magnetic anisotropy and interaction between supported clusters

Stabilization of magnetic order in clusters/nanoparticles at elevated temperatures is a fundamentally challenging problem. The magnetic anisotropy energy (MAE) that prevents the thermal fluctuations of the magnetization direction can be around 1-10 K in free transition metal clusters of around a dozen atoms. Here in this paper we demonstrate that a graphene support can lead to an order of magnitude enhancement in the anisotropy of supported species. Our studies show that the MAE of supported Co 5 and Co 13 clusters on graphene increase by factors of 2.6 and 25, respectively. The enhancement is linked to the splitting of selected electronic orbitals that leads to the different orbital contributions along the easy and hard axis. The conductive support enables a magnetic interaction between the deposited species and the nature of the magnetic interaction can be controlled by the separation between supported clusters or by vacancies offering an unprecedented ability to tune characteristics of assemblies.
 [1] ;  [1] ;  [1]
  1. Virginia Commonwealth Univ., Richmond, VA (United States). Dept. of Physics
Publication Date:
Grant/Contract Number:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 5; Journal ID: ISSN 1367-2630
IOP Publishing
Research Org:
Virginia Commonwealth Univ., Richmond, VA (United States). Dept. of Physics
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetic anisotropy; transition metal clusters; graphene; density functional theory
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1238975; OSTI ID: 1457337