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O Plasma Treatment Enhanced Room Temperature Ferromagnetism in MoS2

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Abstract

MoS2 is a typical two-dimensional material with promising optical and electrical properties. The realization of ferromagnetism in MoS2 is important for its applications in semiconductor spintronics. A facile technique should be developed to induce the ferromagnetism in MoS2, and the possible extrinsic contribution should be avoided. In this paper, flower-like MoS2 nanostructures were fabricated by the hydrothermal method. X-ray diffraction spectra show the 1 T/2H mixed phases of as-prepared MoS2 nanostructures, which changes to pure 2H structure after the O plasma treatment. Raman spectra confirm the existence of Mo–O bonding, which is further confirmed by the X-ray photoelectron spectra after the O plasma treatment. Magnetization measurements at 300 K show the weak ferromagnetism in the as-prepared MoS2, with saturated ferromagnetic magnetization of 0.0012 emu/g. After the O plasma treatment, the weak ferromagnetism is strongly enhanced with saturated ferromagnetic magnetization of 0.0343 emu/g. First principle calculation has been performed to disclose the possible origin of ferromagnetism. Significant overlapping between the density of states of O and Mo, or O and S has been observed. The magnetic contribution from Mo and S is negligible, while O takes the main role for the enhanced ferromagnetism.

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Authors and Affiliations

  1. Yangzhou Polytechnic Institute, Yangzhou, Jiangsu, 225127, China

    Wei Xie & Rui Li

  2. School of Physics, Southeast University, Nanjing, 211189, China

    Bao Wang, Jian Tong & Qingyu Xu

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  1. Wei Xie
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  2. Rui Li
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  3. Bao Wang
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  4. Jian Tong
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  5. Qingyu Xu
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Correspondence to Wei Xie.

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Xie, W., Li, R., Wang, B. et al. O Plasma Treatment Enhanced Room Temperature Ferromagnetism in MoS2. J Supercond Nov Magn 35, 501–506 (2022). https://doi.org/10.1007/s10948-021-06083-7

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  • DOI: https://doi.org/10.1007/s10948-021-06083-7

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