Irradiation enhanced paramagnetism on graphene nanoflakes

A. Ney, P. Papakonstantinou, K. Ajay, NG Shang, N. Peng

Research output: Contribution to journalArticle

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Abstract

We have studied the magnetization of vertically aligned graphene nanoflakes irradiated withnitrogen ions of 100 KeV energy and doses in the range 10^11–10^17 ions/cm^2. The non-irradiated graphene nanoflakes show a paramagnetic contribution, which is increased progressively by ion irradiation at low doses up to 10^15/cm^2. However, further increase on implantation dose reduces the magnetic moment which coincides with the onset of amorphization as verified by both Raman andx-ray photoelectron spectroscopic data. Overall, our results demonstrate the absence of ferromagnetism on either implanted or unimplanted samples from room temperature down to a temperature of 5 K.
LanguageEnglish
Pages102504-1
JournalApplied Physics Letters
Volume99
DOIs
Publication statusPublished - 2 Aug 2011

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paramagnetism
graphene
dosage
irradiation
ion irradiation
ferromagnetism
implantation
rays
ions
photoelectrons
magnetic moments
magnetization
room temperature
temperature
energy

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Ney, A. ; Papakonstantinou, P. ; Ajay, K. ; Shang, NG ; Peng, N. / Irradiation enhanced paramagnetism on graphene nanoflakes. In: Applied Physics Letters. 2011 ; Vol. 99. pp. 102504-1.
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Irradiation enhanced paramagnetism on graphene nanoflakes. / Ney, A.; Papakonstantinou, P.; Ajay, K.; Shang, NG; Peng, N.

In: Applied Physics Letters, Vol. 99, 02.08.2011, p. 102504-1.

Research output: Contribution to journalArticle

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T1 - Irradiation enhanced paramagnetism on graphene nanoflakes

AU - Ney, A.

AU - Papakonstantinou, P.

AU - Ajay, K.

AU - Shang, NG

AU - Peng, N.

PY - 2011/8/2

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AB - We have studied the magnetization of vertically aligned graphene nanoflakes irradiated withnitrogen ions of 100 KeV energy and doses in the range 10^11–10^17 ions/cm^2. The non-irradiated graphene nanoflakes show a paramagnetic contribution, which is increased progressively by ion irradiation at low doses up to 10^15/cm^2. However, further increase on implantation dose reduces the magnetic moment which coincides with the onset of amorphization as verified by both Raman andx-ray photoelectron spectroscopic data. Overall, our results demonstrate the absence of ferromagnetism on either implanted or unimplanted samples from room temperature down to a temperature of 5 K.

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