Nanomaterials (Feb 2024)

Strong Room-Temperature Ferromagnetism of MoS<sub>2</sub> Compound Produced by Defect Generation

  • Chang-Soo Park,
  • Younghae Kwon,
  • Youjoong Kim,
  • Hak Dong Cho,
  • Heetae Kim,
  • Woochul Yang,
  • Deuk Young Kim

DOI
https://doi.org/10.3390/nano14040334
Journal volume & issue
Vol. 14, no. 4
p. 334

Abstract

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Ferromagnetic materials have been attracting great interest in the last two decades due to their application in spintronics devices. One of the hot research areas in magnetism is currently the two-dimensional materials, transition metal dichalcogenides (TMDCs), which have unique physical properties. The origins and mechanisms of transition metal dichalcogenides (TMDCs), especially the correlation between magnetism and defects, have been studied recently. We investigate the changes in magnetic properties with a variation in annealing temperature for the nanoscale compound MoS2. The pristine MoS2 exhibits diamagnetic properties from low-to-room temperature. However, MoS2 compounds annealed at different temperatures showed that the controllable magnetism and the strongest ferromagnetic results were obtained for the 700 °C-annealed sample. These magnetizations are attributed to the unpaired electrons of vacancy defects that are induced by annealing, which are confirmed using Raman spectroscopy and electron paramagnetic resonance spectroscopy (EPR).

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