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Antiferro quadrupolar ordering in Fe intercalated few layers graphene
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/content/aip/journal/adva/3/7/10.1063/1.4816791
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Figures

Image of FIG. 1.

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FIG. 1.

(a) X-ray diffraction patterns for three samples (GF1, GF2 and GF3) indicating the crystal phase of γ-FeOOH along with Fe intercalated graphene peak. (b) TEM image showing some isolated γ-FeOOH nanoparticles grown on iron intercalated graphene surface. (c) Table reporting the rough estimate of C and Fe concentrations of the three samples as obtained from EDX analysis.

Image of FIG. 2.

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FIG. 2.

(a) Raman study for the GF sample. The inset of figure 2 (a) shows the splitting of G peak confirming the intercalation of Fe in graphene and the number of layers present in the Fe intercalated FLG. XPS spectra of GF (b) full survey (c) survey for Fe2p.

Image of FIG. 3.

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FIG. 3.

Spin density distributions of (a) occupied HOMO-33 (side and top view) and (b) unoccupied LUMO-115 (right) molecular orbitals for the optimized iron intercalated graphene structure, calculated using GAUSSIAN 03 with UB3LYP/6-31G method

Image of FIG. 4.

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FIG. 4.

(a) ZFC-FC curves for GF1 at 50Oe which gives ordinary antiferromagnetic interaction due to γ-FeOOH nanoparticles. (b) FC curve for GF1 at 1 T showing the disappearance of Neel temperature at higher magnetic field.

Image of FIG. 5.

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FIG. 5.

(a) ZFC-FC curves for GF2 at 50Oe. (b) Enlarged view of FC curves for GF2 at different fields. The ordering temperature (T) increases from 35.5 K to 47.5 K for a field variation up to 1 T. (c) Schematic representation of the interaction between the intercalated Fe ‘d ' orbitals with the ‘p' orbitals of graphene.

Image of FIG. 6.

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FIG. 6.

FC curves for GF3 at 50Oe and 1 T and the inset shows the enlarged view of the marked region.

Tables

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Table I.

Compositions for three different Fe intercalated FLG composite.

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/content/aip/journal/adva/3/7/10.1063/1.4816791
2013-07-25
2014-04-23

Abstract

The π electron cloud above and below the honeycomb structure of graphene causes each carbon atom to carry a permanent electric quadrupole moment which can attach any cation to impart interesting physical properties. We have synthesized Fe intercalated graphene structures to investigate tunable magnetic properties as a result of this chemical modification. An interesting antiferro quadrupolar ordering is observed which arises due to a coupling between magnetic dipole moment of Fe and electric quadrupole moment on graphene surface. In contrast to antiferromagnetic Neel temperature (T), here the ordering temperature (T) increases from 35.5 K to 47.5 K as the magnetic field is raised upto 1 Tesla.

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Scitation: Antiferro quadrupolar ordering in Fe intercalated few layers graphene
http://aip.metastore.ingenta.com/content/aip/journal/adva/3/7/10.1063/1.4816791
10.1063/1.4816791
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