File(s) under permanent embargo

Electric contributions to magnetic force microscopy response from graphene and MoS2 nanosheets

journal contribution
posted on 07.12.2014, 00:00 authored by Luhua LiLuhua Li, Ying (Ian) ChenYing (Ian) Chen
Magnetic 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 Physics

Volume

116

Issue

21

Pagination

2 - 7

Publisher

American Institute of Physics Inc.

Location

College Park, MD

ISSN

0021-8979

eISSN

1089-7550

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2014, American Institute of Physics