Reversible Tuning of the Ferromagnetic Behavior in Mn-Doped MoS2 Nanosheets via Interface Charge Transfer

Hao Tan, Chao Wang, Wei Hu, Hengli Duan, Peng Guo, Na Li, Guinan Li, Liang Cai, Zhihu Sun*, Fengchun Hu, Wensheng Yan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Reversible manipulation of the magnetic behavior of two-dimensional van der Waals crystals is crucial for expanding their applications in spin-based information-processing technologies. However, to date, most experimental approaches to tune the magnetic properties are single way and have very limited practical applications. Here, we report an interface charge-transfer method for obtaining a reversible and air-stable magnetic response at room temperature in Mn-doped MoS2 nanosheets. By adsorption of benzyl viologen (BV) molecules as the charge donor, the saturation magnetization of Mn-doped MoS2 nanosheets is enhanced by a magnitude of 60%, and the magnetization can be restored to the original value when the adsorbed BV molecules are removed. This cycle can be repeated many times on the same sample without detectable degradation. Experimental characterizations and first-principles calculations suggest that the enhanced magnetization can be attributed to the increase of Mn magnetic moment because of the enriched electrons transferred from BV molecules. This work shows that interface charge transfer may open up a new pathway for reversibly tuning the exchange interactions in two-dimensional nanostructures.

Original languageEnglish (US)
Pages (from-to)31648-31654
Number of pages7
JournalACS Applied Materials and Interfaces
Volume10
Issue number37
DOIs
StatePublished - Sep 19 2018

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11435012, U1632263, 21533007, 11775225, and 11604341) and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (11621063). The authors acknowledge BSRF, SSRF, and NSRL for the synchrotron beamtime.

Publisher Copyright:
© 2018 American Chemical Society.

Keywords

  • 2D van der Waals crystals
  • first-principles calculations
  • interface charge transfer
  • magnetic interaction
  • reversible manipulation

ASJC Scopus subject areas

  • General Materials Science

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