Multilayered graphene acquires ferromagnetism in proximity with magnetite particles

作者：Seifu Dereje^*; Neupane Suman; Giri Lily; Karna Shashi P; Hong Haiping; Seehra M S

来源：Applied Physics Letters, 2015, 106(21): 212401.

DOI：10.1063/1.4921770

Anisotropic diamagnetism of pristine graphite and graphene is well known. Here, evidence of significant induced ferromagnetism in multilayer graphene (MLG) decorated with ferrimagnetic Fe3O4 particles is reported. This MLG-Fe3O4 nano-composite was prepared by a one-step ultrasonic treatment at 75 degrees C in the surfactant sodium dodecyl-benzene-sulfonate. To verify the phase structure and morphology of the composite, X-ray diffraction, scanning and transmission electron microscopy, scanning tunneling electron microscopy, and Raman spectroscopy were employed. Room temperature data of magnetization versus magnetic field showed that the saturation magnetization M-S = 58.6 emu/gm for pristine Fe3O4 increased to M-S = 158.4 emu/gm for a 1:1 composite of Fe3O4 to MLG. These results lead to induced M-S = 253 emu/gm in MLG resulting from its proximity to Fe3O4. Similar experiments on Fe3O4 to single walled carbon nanotubes (SWNT) composite did not show any induced magnetism in SWNT.

• 出版日期2015-5-25