High-Energy Proton-Irradiation Effects on the Magnetism of the Transition-Metal Dichalcogenide MoS2
We have studied the effects of high-energy proton irradiation on the magnetism of the transition-metal dichalcogenide MoS2. The pristine sample showed ferromagnetic and paramagnetic responses with a diamagnetic background, which all decreased initially with increasing irradiation dose. The ferromagnetic component increased subsequently with further irradiation, for which a spin-3/2 species was identified from the analysis of the M(H) curve, in contrast to the spin-1 species identified in the pristine sample. The magnetism in our MoS2 samples may be accounted for by the structural defects that apparently are cured by low-dose proton irradiation and subsequently become significant by further irradiation.
KeywordsMoS2 High-energy proton irradiation Magnetism Structural defects
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This work was supported by the Ministry of Education and the National Research Foundation of Korea (Project No. 2019S1A5A2A03050121). The Korea Basic Science Institute (KBSI) and the Korea Multi-Purpose Accelerator Complex (KOMAC) are, respectively, acknowledged for the measurements and the proton irradiation.