RKKY interaction between adsorbed magnetic impurities in graphene: symmetry and strain effects
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2013Access:
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P. D. Gorman, J. Duffy, M. S. Ferreira and S. R. Power, RKKY interaction between adsorbed magnetic impurities in graphene: symmetry and strain effects, Physical Review B, 88, 2013, 085405-Download Item:
Abstract:
The growing interest in carbon-based spintronics has stimulated a number of recent theoretical studies on
the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in graphene, with the aim of determining the most
energetically favorable alignments between embedded magnetic moments. The RKKY interaction in undoped
graphene decays faster than expected for conventional two-dimensional materials, and recent studies suggest
that the adsorption configurations favored by many transition-metal impurities may lead to even shorter-ranged
decays and possible sign-changing oscillations. Here, we show that these features emerge in a mathematically
transparent manner when the symmetry of the configurations is included in the calculation. Furthermore, we show
that by breaking the symmetry of the graphene lattice, via uniaxial strain, the decay rate, and hence the range,
of the RKKY interaction can be significantly altered. Our results suggest that magnetic interactions between
adsorbed impurities in graphene can be manipulated by careful strain engineering of such systems.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
11/RFP.1/MTR/3083
Author's Homepage:
http://people.tcd.ie/ferreirmhttp://people.tcd.ie/stpower
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Author: Ferreira, Mauro; Power, Stephen
Sponsor:
Science Foundation Ireland (SFI)Type of material:
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Physical Review B88
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grapheneSubject (TCD):
Nanoscience & MaterialsDOI:
http://dx.doi.org/10.1103/PhysRevB.88.085405Metadata
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