Chinese Physics B, Volume. 29, Issue 9, (2020)
First-principles study of magnetism of 3d transition metals and nitrogen co-doped monolayer MoS2
The electronic structures and magnetic properties of diverse transition metal (TM = Fe, Co, and Ni) and nitrogen (N) co-doped monolayer MoS2 are investigated by using density functional theory. The results show that the intrinsic MoS2 does not have magnetism initially, but doped with TM (TM = Fe, Co, and Ni) the MoS2 possesses an obvious magnetism distinctly. The magnetic moment mainly comes from unpaired Mo:4d orbitals and the d orbitals of the dopants, as well as the S:3p states. However, the doping system exhibits certain half-metallic properties, so we select N atoms in the V family as a dopant to adjust its half-metal characteristics. The results show that the (Fe, N) co-doped MoS2 can be a satisfactory material for applications in spintronic devices. On this basis, the most stable geometry of the (2Fe–N) co-doped MoS2 system is determined by considering the different configurations of the positions of the two Fe atoms. It is found that the ferromagnetic mechanism of the (2Fe–N) co-doped MoS2 system is caused by the bond spin polarization mechanism of the Fe–Mo–Fe coupling chain. Our results verify that the (Fe, N) co-doped single-layer MoS2 has the conditions required to become a dilute magnetic semiconductor.
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Long Lin, Yi-Peng Guo, Chao-Zheng He, Hua-Long Tao, Jing-Tao Huang, Wei-Yang Yu, Rui-Xin Chen, Meng-Si Lou, Long-Bin Yan. First-principles study of magnetism of 3d transition metals and nitrogen co-doped monolayer MoS2[J]. Chinese Physics B, 2020, 29(9):
Received: Apr. 12, 2020
Accepted: --
Published Online: Apr. 29, 2021
The Author Email: He Chao-Zheng (hecz2019@xatu.edu.cn)