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We investigate the magnetic phase diagram of 1T-vanadium dichalcogenidemonolayers in Janus configuration (VSeTe, VSSe, and VSTe) from firstprinciples. The magnetic exchange, magnetocrystalline anisotropy andDzyaloshinskii-Moriya interaction (DMI) are computed using density functionaltheory calculations, while the temperature- and field-dependent magnetic phasediagram is simulated using large-scale atomistic spin modeling in the presenceof thermal fluctuations. The boundaries between magnetic ordered phases andparamagnetic phases are determined by cross-analyzing the average topologicalcharge with the magnetic susceptibility and its derivatives. We find that insuch Janus monolayers, DMI is large enough to stabilize non-trivial chiraltextures. In VSeTe monolayer, an asymmetrical bimeron lattice state isstabilized for in-plane field configuration whereas skyrmion lattice is formedfor out-of-plane field configuration. In VSSe monolayer, a skyrmion lattice isstabilized for out-of-plane field configuration. This study demonstrates thatnon-centrosymmetric van der Waals magnetic monolayers can support topologicaltextures close to room temperature.

Topologically stable bimerons and skyrmions in vanadium dichalcogenide Janus monolayers