Using graphene to control magnetic anisotropy and interaction between supported clusters

Sahoo, Sanjubala; Islam, M. Fhokrul; Khanna, Shiv N.

doi:10.1088/1367-2630/17/5/053052

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

Journal Article · Fri May 01 00:00:00 EDT 2015 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/17/5/053052· OSTI ID:1238974

Sahoo, Sanjubala; Islam, M. Fhokrul; Khanna, Shiv N.

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 Co₅ and Co₁₃ 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.

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Research Organization:: Virginia Commonwealth Univ., Richmond, VA (United States). Dept. of Physics

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: SC0006420

OSTI ID:: 1238974

Alternate ID(s):: OSTI ID: 1238975; OSTI ID: 1457337

Journal Information:: New Journal of Physics, Vol. 17, Issue 5; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 4 works

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36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
magnetic anisotropy
transition metal clusters
graphene
density functional theory

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

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