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Electric contributions to magnetic force microscopy response from graphene and MoS2 nanosheets
journal contribution
posted on 2014-12-07, 00:00 authored by Luhua LiLuhua Li, Ying (Ian) ChenYing (Ian) ChenMagnetic force microscopy (MFM) signals have recently been detected from whole pieces of mechanically exfoliated graphene and molybdenum disulfide (MoS2) nanosheets, and magnetism of the two nanomaterials was claimed based on these observations. However, non-magnetic interactions or artefacts are commonly associated with MFM signals, which make the interpretation of MFM signals not straightforward. A systematic investigation has been done to examine possible sources of the MFM signals from graphene and MoS2 nanosheets and whether the MFM signals can be correlated with magnetism. It is found that the MFM signals have significant non-magnetic contributions due to capacitive and electrostatic interactions between the nanosheets and conductive cantilever tip, as demonstrated by electric force microscopy and scanning Kevin probe microscopy analyses. In addition, the MFM signals of graphene and MoS2 nanosheets are not responsive to reversed magnetic field of the magnetic cantilever tip. Therefore, the observed MFM response is mainly from electric artefacts and not compelling enough to correlate with magnetism of graphene and MoS2 nanosheets.
History
Journal
Journal of Applied PhysicsVolume
116Issue
21Pagination
2 - 7Publisher
American Institute of Physics Inc.Location
College Park, MDPublisher DOI
ISSN
0021-8979eISSN
1089-7550Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2014, American Institute of PhysicsUsage metrics
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