Spin dynamics and relaxation in graphene nanoribbons: Electron spin resonance probing

Singamaneni S. Rao, Andre Stesmans, Johan Van Tol, Dmitry V. Kosynkin, A. Higginbotham-Duque, Wei Lu, Alexander Sinitskii, James M. Tour

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Here we report the results of a multifrequency (∼9, 20, 34, 239.2, and 336 GHz) variable-temperature continuous wave (cw) and X-band (∼9 GHz) pulse electron spin resonance (ESR) measurement performed at cryogenic temperatures on potassium split graphene nanoribbons (GNRs). Important experimental findings include the following: (a) The multifrequency cw ESR data infer the presence of only carbon-related paramagnetic nonbonding states, at any measured temperature, with the g value independent of microwave frequency and temperature. (b) A linear broadening of the ESR signal as a function of microwave frequency is noticed. The observed linear frequency dependence of ESR signal width points to a distribution of g factors causing the non-Lorentzian line shape, and the g broadening contribution is found to be very small. (c) The ESR process is found to be characterized by slow and fast components, whose temperature dependences could be well described by a tunneling level state model. This work not only could help in advancing the present fundamental understanding on the edge spin (or magnetic)-based properties of GNRs but also pave the way to GNR-based spin devices.

Original languageEnglish (US)
Pages (from-to)7615-7623
Number of pages9
JournalACS Nano
Volume6
Issue number9
DOIs
StatePublished - Sep 25 2012

Fingerprint

Spin dynamics
Nanoribbons
Carbon Nanotubes
Graphite
spin dynamics
Graphene
Paramagnetic resonance
electron paramagnetic resonance
graphene
Microwave frequencies
microwave frequencies
continuous radiation
Temperature
cryogenic temperature
superhigh frequencies
Cryogenics
temperature
line shape
Potassium
potassium

Keywords

  • edge spin
  • electron spin relaxation rate
  • electron spin resonance
  • graphene nanoribbons
  • tunneling level states

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Rao, S. S., Stesmans, A., Van Tol, J., Kosynkin, D. V., Higginbotham-Duque, A., Lu, W., ... Tour, J. M. (2012). Spin dynamics and relaxation in graphene nanoribbons: Electron spin resonance probing. ACS Nano, 6(9), 7615-7623. https://doi.org/10.1021/nn302745x

Spin dynamics and relaxation in graphene nanoribbons : Electron spin resonance probing. / Rao, Singamaneni S.; Stesmans, Andre; Van Tol, Johan; Kosynkin, Dmitry V.; Higginbotham-Duque, A.; Lu, Wei; Sinitskii, Alexander; Tour, James M.

In: ACS Nano, Vol. 6, No. 9, 25.09.2012, p. 7615-7623.

Research output: Contribution to journalArticle

Rao, SS, Stesmans, A, Van Tol, J, Kosynkin, DV, Higginbotham-Duque, A, Lu, W, Sinitskii, A & Tour, JM 2012, 'Spin dynamics and relaxation in graphene nanoribbons: Electron spin resonance probing', ACS Nano, vol. 6, no. 9, pp. 7615-7623. https://doi.org/10.1021/nn302745x
Rao SS, Stesmans A, Van Tol J, Kosynkin DV, Higginbotham-Duque A, Lu W et al. Spin dynamics and relaxation in graphene nanoribbons: Electron spin resonance probing. ACS Nano. 2012 Sep 25;6(9):7615-7623. https://doi.org/10.1021/nn302745x
Rao, Singamaneni S. ; Stesmans, Andre ; Van Tol, Johan ; Kosynkin, Dmitry V. ; Higginbotham-Duque, A. ; Lu, Wei ; Sinitskii, Alexander ; Tour, James M. / Spin dynamics and relaxation in graphene nanoribbons : Electron spin resonance probing. In: ACS Nano. 2012 ; Vol. 6, No. 9. pp. 7615-7623.
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