Kavli Affiliate: Bo Gu
| First 5 Authors: Jia Wen Li, Gang Su, Bo Gu, ,
| Summary:
Realizing ferromagnetic semiconductors with room Curie temperature $Trm_C$
remains a challenge in spintronics. Inspired by the recent experimental
progress on the nanotubes based on 2D van der Waals non-magnetic
transition-metal dichalcogenides, magnetic nanotubes based on monolayer
ferromagnetic materials are highly possible. Here, we proposed a way how to
obtain high $Trm_C$ ferromagnetic semiconductor nanotubes. Some high $Trm_C$
ferromagnetic semiconductors are predicted in the MX$_2$ nanotubes (M = V, Cr,
Mn, Fe, Co, Ni; X = S, Se, Te), including CrS$_2$ and CrTe$_2$ zigzag nanotubes
with the diameter of 18 unit cells showing $Trm_C$ above 300 K. In addition,
due to the strain gradient in walls of nanotubes, an electrical polarization at
level of $0.1$ eV/AA~inward of the radial direction is obtained. Our results
not only present novel ferromagnetic semiconductor nanotubes with room Curie
temperature but also be indicative of how to obtain such nanotubes based on
experimentally obtained 2D high $Trm_C$ ferromagnetic metals.
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