Skyrmion formation in Ni-based Janus dihalide monolayers: Interplay between magnetic frustration and Dzyaloshinskii-Moriya interaction

I will present a comprehensive theory of the magnetic phases in monolayer nickel-based Janus dihalides (NiIBr,NiICl,NiBrCl) by using first principle calculations and atomistic simulations. The parameters of the interacting spin Hamiltonian extracted from ab-initio calculations show that nickel-dihalide Janus monolayers exhibit varying degrees of magnetic frustration together with a large Dzyaloshinskii_Moriya interaction due to their inherent inversion breaking symmetry. The atomistic simulations reveal a delicate interplay between these two competing magnetic interactions in giving rise to skyrmion formation.