Defect mediated magnetic transitions in Fe and Mn doped MoS2

We report single-phase syntheses of undoped 2H-MoS 2 as well as Mn and Fe doped MoS 2 by a facile hydrothermal route. The formation of the 2H-MoS 2 phase was confirmed by XRD and was corroborated with Raman spectra. The morphology of the doped and undoped MoS 2 nanostructures comprised sheets, as revealed by TEM and STEM images. The fine granular structure was observed by high resolution TEM micrographs. The STEM-EDS results show dopant concentrations of ∼1 atom% corresponding to Mn and Fe in doped MoS 2 . The undoped MoS 2 revealed diamagnetic behavior at room temperature and paramagnetic behavior in the range (100 to 300 K). The Mn-MoS 2 sample displayed ferromagnetism below 20 K with a coercive field of ∼50 O e . Such a sample may be utilized for magnetic switching purposes at low temperatures. The onset of the antiferromagnetic interaction was observed below 145 K in Fe-MoS 2 samples. They have been understood in terms of long-range magnetic interactions amongst the dipole moments mediated via surface defects as well as the interaction between the dipoles and the surface charges. The findings are corroborated with the help of EPR studies. We report single-phase syntheses of undoped 2H-MoS 2 as well as Mn and Fe doped MoS 2 by a facile hydrothermal route.