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Synthesis and Magnetic Properties of FeCo/Edge-Oxidized Graphene Nanocomposites
New Phys.: Sae Mulli 2018; 68: 296~300
Published online March 30, 2018;
© 2018 New Physics: Sae Mulli.

Jinu KIM1, Ki Hyeon KIM*1, Baekil NAM2

1 Department of Physics, Yeungnam University, Gyeongsan 38541, Korea
2 School of General Education, Yeungnam University, Gyeongsan 38541, Korea
Correspondence to:
Received December 15, 2017; Accepted January 30, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
FeCo/graphene composites were prepared with increasing graphene weight percent. The graphene-oxide sheets employed water-dispersible edge-oxidized graphene with a lateral size of about 2 - 3 $\mu$m and an average thickness of below 5 nm. The FeCo/graphene composites were synthesized by using the coprecipitation method. With increasing graphene concentration in the FeCo/graphene composites, the synthesized FeCo nanoparticles were attached on the edge and the plane of the graphene. The saturation magnetizations and coercivities of the FeCo/graphene composites were 152 emu/g, 85 emu/g, 37 emu/g, 13.5 emu/g and 881 Oe, 766 Oe, 567 Oe, 115 Oe for 0 wt.%, 36 wt.%, 53 wt.%, and 69 wt.% of graphene, respectively. The real parts of the permeabilities of the FeCo/graphene composites were about 1.21 (0 wt.%), 1.10 (36 wt.%), 1.06 (53 wt.%) and 1.00 (69 wt.%) at 1 GHz, after which the permeability abruptly decreased with increasing frequency up to 18 GHz.
PACS numbers: 75.50.-y, 75.90.+w, 77.84.-s
Keywords: FeCo, Graphene oxide, Permeability, Nanocomposite

July 2018, 68 (7)
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