@article{b5311b0613ff431d839811cf8d6fa400,
title = "The effects of substitutional Fe-doping on magnetism in MoS2 and WS2 monolayers",
abstract = "Doping of two-dimensional (2D) semiconductors has been intensively studied toward modulating their electrical, optical, and magnetic properties. While ferromagnetic 2D semiconductors hold promise for future spintronics and valleytronics, the origin of ferromagnetism in 2D materials remains unclear. Here, we show that substitutional Fe-doping of MoS2 andWS2 monolayers induce different magnetic properties. The Fe-doped monolayers are directly synthesized via chemical vapor deposition. In both cases, Fe substitutional doping is successfully achieved, as confirmed using scanning transmission electron microscopy. While both Fe:MoS2 and Fe:WS2 show PL quenching and n-type doping, Fe dopants in WS2 monolayers are found to assume deep-level trap states, in contrast to the case of Fe:MoS2, where the states are found to be shallow. Using μm- and mm-precision local NV- magnetometry and superconducting quantum interference device, we discover that, unlike MoS2 monolayers, WS2 monolayers do not show a magnetic phase transition to ferromagnetism upon Fe-doping. The absence of ferromagnetism in Fe:WS2 is corroborated using density functional theory calculations.",
author = "Kyungnam Kang and Shichen Fu and Kamran Shayan and Yoshimura Anthony and Siamak Dadras and Xiong Yuzan and Fujisawa Kazunori and Mauricio Terrones and Wei Zhang and Stefan Strauf and Vincent Meunier and Vamivakas, {A. Nick} and Yang, {Eui Hyeok}",
note = "Funding Information: The authors thank Dr Tai-De Li of the Surface Science Facility at CUNY Advanced Science Research Center for assisting the XPS measurement. S S acknowledges financial support by the National Science Foundation (NSF) under Grant NSF-DMR-1809235, NSF-EFRI-1641094, and ECCS-MRI-1531237. EHY acknowledges financial support by the Air Force Office of Scientific Research under Grant FA9550-11-10272 and the NSF under Grant ECCS-MRI-1531237. This work was also partially carried out at the Micro Device Laboratory (MDL) at Stevens Institute of Technology, funded with support from W15QKN-05-D-0011. AY and VM acknowledge the support of the NSF under Grant NSF-ECCS-1608171. DFT calculations were performed in the Center for Computational Innovations at Rensselaer Polytechnic Institute. DFT calculations were performed in the Center for Computational Innovations at Rensselaer Polytechnic Institute. ANV acknowledges the support by the NSF under Grant NSF-CAREER-DMR-1553788 and the Air Force Office of Scientific Research under Grant FA9550-19-1-0074. The use of SQUID is supported by DOE, BES, Materials Science and Engineering Division. This research used microscopy resources, which was partially funded by the NSF via Grant NSF-DMR-0922522, within the Laboratory for Multi-scale Imaging (LMSI) at Stevens Institute of Technology. Publisher Copyright: {\textcopyright} 2020 IOP Publishing Ltd.",
year = "2020",
month = dec,
day = "10",
doi = "10.1088/1361-6528/abcd61",
language = "English (US)",
volume = "32",
journal = "Nanotechnology",
issn = "0957-4484",
publisher = "IOP Publishing Ltd.",
number = "9",
}