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Spin-half paramagnetism in graphene induced by point defects

Nair, R R; Sepioni, M; Tsai, I L; Lehtinen, O; Keinonen, J; Krasheninnikov, A V; Thomson, T; Geim, A K; Grigorieva, I V

Nature Physics. 2012;8(3):199-202.

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Abstract

The possibility to induce a magnetic response in graphene by the introduction of defects has been generating much interest, as this would expand the already impressive list of its special properties and allow novel devices where charge and spin manipulation could be combined. So far there have been many theoretical studies (for reviews, see refs 1-3) predicting that point defects in graphene should carry magnetic moments mu similar to mu(B) and these can in principle couple (anti) ferromagnetically(1-12). However, experimental evidence for such magnetism remains both scarce and controversial(13-16). Here we show that point defects in graphene-(1) fluorine adatoms in concentrations x gradually increasing to stoichiometric fluorographene CFx=1.0 (ref. 17) and (2) irradiation defects (vacancies)-carry magnetic moments with spin 1/2. Both types of defect lead to notable paramagnetism but no magnetic ordering could be detected down to liquid helium temperatures. The induced paramagnetism dominates graphene's low-temperature magnetic properties, despite the fact that the maximum response we could achieve was limited to one moment per approximately 1,000 carbon atoms. This limitation is explained by clustering of adatoms and, for the case of vacancies, by the loss of graphene's structural stability. Our work clarifies the controversial issue of graphene's magnetism and sets limits for other graphitic compounds.

Keyword(s)

fluorination

Bibliographic metadata

Type of resource:
Content type:
Published date:
Language:
english
Journal title:
Alternative journal title:
Nat Phys
ISSN:
Volume:
8
Issue:
3
Start page:
199
End page:
202
Total:
4
Pagination:
199-202
Digital Object Identifier:
Doi 10.1038/Nphys2183
ISI Accession Number:
ISI:000300929800013
Related website(s):
  • Related website <Go to ISI>://000300929800013
General notes:
  • 900ZA Times Cited:42 Cited References Count:31
Access state:
Active

Institutional metadata

University researcher(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:192528
Created by:
Hawthornthwaite, Sabina
Created:
19th April, 2013, 14:51:14
Last modified by:
Hawthornthwaite, Sabina
Last modified:
27th November, 2013, 12:46:29

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