Large Metallic Vanadium Disulfide Ultrathin Flakes
for Spintronic Circuits and Quantum Computing Devices
Version 2 2019-05-31, 14:41Version 2 2019-05-31, 14:41
Version 1 2019-05-31, 14:34Version 1 2019-05-31, 14:34
Posted on 2019-05-31 - 14:41
Atmospheric pressure chemical vapor
deposition (APCVD) is employed
for the synthesis of layered vanadium disulfide. By tuning several
critical growth parameters, we achieve VS2 flakes with
lateral dimension over 100 μm and thickness down to monolayer
(∼0.59 nm) and bilayer (∼1.17 nm), which are larger
and thinner than those previously reported in the literature. Furthermore,
ultrathin flakes with thicknesses of several atomic layers are directly
synthesized on mica and SiO2 substrates without the use
of an exfoliation method. X-ray diffraction and high-resolution transmission
electron microscopy confirm the flakes’ monocrystalline quality.
Raman spectra are collected and are consistent with the vibrational
modes for the trigonal phase of VS2 as determined by density
functional theory calculations. Through electron backscatter diffraction
pole figure analysis, transmission electron microscopy, and optical
microscopy, a complex epitaxial relationship with nine preferred in-plane
orientations is observed in some regions of the VS2/mica
samples. Remarkably, this is in agreement qualitatively with a superlattice
area mismatch model, providing further evidence of the interfacial
interactions with mica dictating the nucleation of film atoms in van
der Waals heterostructures. Finally, magnetic force microscopy measurements
suggest room-temperature ferromagnetism in ultrathin VS2 flakes, in agreement with several density functional theory calculations.
The discovery of an ultrathin ferromagnetic metal such as VS2 may have an impact on emerging fields such as spintronics and quantum
computing.
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Littlejohn, Aaron J.; Li, Zhaodong; Lu, Zonghuan; Sun, Xin; Nawarat, Poomirat; Wang, Yiping; et al. (2019). Large Metallic Vanadium Disulfide Ultrathin Flakes
for Spintronic Circuits and Quantum Computing Devices. ACS Publications. Collection. https://doi.org/10.1021/acsanm.9b00608