Direct ESR evidence for magnetic behaviour of graphene

Details Direct ESR evidence for magnetic behaviour of graphene Direct ESR evidence for magnetic behaviour of graphene

2010-06-24

arxiv.org/abs/1006.4840v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Presented in EMRS SPRING 2010

Scientific paper

Recently, there have appeared theoretical works on the magnetic properties of graphene and graphene nanoribbons envisaging possible spin-based applications along with fundamental scientific insight. The theoretical efforts, however, appear not paralleled by experimental investigation to test magnetic properties. Yet, room temperature ferromagnetism (RTFM) has recently been experimentally reported in graphene (G-600) [Nano. Letters 9, 220 (2009)], the origin of which remains still unexplored. Inspired by this observation, and in attempt to trace the origin of RTFM, we here report on low temperature K-band electron spin resonance (ESR) observations on G-600. Two distinct C-related paramagnetic signals are revealed, both of a Lorentzian shape: a) a broad at g = 2.00278 which can be attributed to graphitic-like (GL) carbon; b) a narrower signal at g = 2.00288 which is associated with free radical like (FL) carbon. No other signals could be detected. We speculate that the GL ESR signal may come from the conductive {\pi}-carriers propagating in the interior of graphene sheets, while the FL ESR signal may stem from the edges of graphene sheets due to non-bonding localized electronic states. It is suggested that the long range direct/indirect exchange interaction between GL and FL C-related magnetic spin centers may lead to the reported RTFM, this pointing to C origin of the later.

Affiliated with

Also associated with

No associations

Rating

Direct ESR evidence for magnetic behaviour of graphene does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Direct ESR evidence for magnetic behaviour of graphene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct ESR evidence for magnetic behaviour of graphene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-676371