  Two-dimensional (2D) ferromagnetic materials present promising candidates for
spintronic devices, and the half-metallic materials with 100% spin polarization
at Fermi energy level are highly desired for many spin-based devices. 2D Janus
materials have attracted great attention in recent years due to their excellent
properties induced by breaking the symmetry. Here, using the density functional
theory, we report that the Janus V2AsP monolayer demonstrates a charming
ferromagnetic half-metallic feature. It is dynamically stable in view of the
absence of imaginary frequency phonon. The half-metallic gap is about 0.38 eV
and the spin splitting of about 1.34eV for the V2AsP monolayer. Interestingly,
a tensile strain of 4.9% can induce it to undergo a phase transition from
ferromagnetic to anti-ferromagnetic state. Moreover, the Curie temperature (Tc)
enhances with the increase of compressive strain. All there appealing
properties make the half-metallic Janus V2AsP monolayer a promising material
for 2D spintronic applications.
