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Defect mediated magnetic transitions in Fe and Mn doped MoS2

Abstract

We report single phase syntheses of undoped 2H-MoS2 as well as Mn and Fe doped MoS2 by a facile hydrothermal route. The formation of 2H-MoS2 phase was confirmed by XRD and was corroborated with Raman spectra. The morphology of the doped and undoped MoS2 nanostructures comprised of sheets as revealed by TEM and STEM images.The fine granular structure was observed by high resolution TEM micrographs. The STEM-EDS results show dopants concentration of ~ 1 atom % corresponding to Mn and Fe in doped MoS2.The undoped MoS2 revealed diamagnetic behavior at room temperature and paramagnetic in the range (100 to 300 K). The Mn-MoS2 sample displayed ferromagnetism below 20 K with coercive field ~ 50 Oe. Such a sample may be utilized for magnetic switching purposes at low temperatures. The onset of antiferromagnetic interaction has been observed below 145 K in Fe-MoS2 samples. They have been understood in terms of long-range magnetic interactions amongst the dipole moments mediated via the surface defects as well as the interaction between the dipoles and the surface charges. Findings are corroborated with the help of EPR studies.

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Publication details

The article was accepted on 17 May 2018 and first published on 17 May 2018


Article type: Paper
DOI: 10.1039/C8CP02882F
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Defect mediated magnetic transitions in Fe and Mn doped MoS2

    M. K. Singh, P. Chettri, A. Tripathi, A. Tiwari, B. Mukherjee and R. K. mandal, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP02882F

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