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Magnetic skyrmions are nano-scale spin structures that are promising forultra-dense memory and logic devices. Recent progresses in two-dimensionalmagnets encourage the idea to realize skyrmionic states in freestandingmonolayers. However, monolayers such as CrI3 lack Dzyaloshinskii-Moriyainteractions (DMI) and thus do not naturally exhibit skyrmions but rather aferromagnetic state. Here we propose the fabrication of Cr(I,X)3 Janusmonolayers, in which the Cr atoms are covalently bonded to the underlying Iions and top-layer Br or Cl atoms. By performing first-principles calculationsand Monte-Carlo simulations, we identify strong enough DMI, which leads to notonly helical cycloid phases, but also to intrinsic skyrmionic states inCr(I,Br)3 and magnetic-field-induced skyrmions in Cr(I,Cl)3.

Magnetic Skyrmion State in Janus Monolayers of Chromium Trihalides Cr(I,X)3