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

Abstract

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.

Authors:
; ;
Publication Date:
Research Org.:
Virginia Commonwealth Univ., Richmond, VA (United States). Dept. of Physics
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1238974
Alternate Identifier(s):
OSTI ID: 1238975; OSTI ID: 1457337
Grant/Contract Number:  
SC0006420
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 5; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetic anisotropy; transition metal clusters; graphene; density functional theory

Citation Formats

Sahoo, Sanjubala, Islam, M. Fhokrul, and Khanna, Shiv N. Using graphene to control magnetic anisotropy and interaction between supported clusters. United Kingdom: N. p., 2015. Web. doi:10.1088/1367-2630/17/5/053052.
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Sahoo, Sanjubala, Islam, M. Fhokrul, & Khanna, Shiv N. Using graphene to control magnetic anisotropy and interaction between supported clusters. United Kingdom. https://doi.org/10.1088/1367-2630/17/5/053052
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Sahoo, Sanjubala, Islam, M. Fhokrul, and Khanna, Shiv N. Fri . "Using graphene to control magnetic anisotropy and interaction between supported clusters". United Kingdom. https://doi.org/10.1088/1367-2630/17/5/053052.
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@article{osti_1238974,
title = {Using graphene to control magnetic anisotropy and interaction between supported clusters},
author = {Sahoo, Sanjubala and Islam, M. Fhokrul and Khanna, Shiv N.},
abstractNote = {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.},
doi = {10.1088/1367-2630/17/5/053052},
journal = {New Journal of Physics},
number = 5,
volume = 17,
place = {United Kingdom},
year = {Fri May 01 00:00:00 EDT 2015},
month = {Fri May 01 00:00:00 EDT 2015}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1088/1367-2630/17/5/053052
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Cited by: 4 works
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Figures / Tables:

Figure 1. Figure 1.: Geometrically optimized structures of free (a) and (b) and graphene-supported (c) and (d) Co5 and Co13 showing the onsite spin moments (in μB)mi, where ‘i’ denotes the atom index. The light (orange) and dark (black) balls denote the Co and C atoms,respectively. The blue arrows represent the easymore » (E) and hard axis (H) for each case.« less
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    Figures / Tables found in this record:

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    Table 2. (p. 6)table
    Figure 3. (p. 8)figure
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