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Noncollinear spin textures in low-dimensional magnetic systems have beenstudied for decades because of their extraordinary properties and promisingapplications derived from the chirality and topological nature. However,material realizations of topological spin states are still limited. Employingfirst-principles and Monte Carlo simulations, we propose that monolayerchromium trichloride (CrCl3) can be a promising candidate for observing thevortex/antivortex type of topological defects, so-called merons. The numbers ofvortices and antivortices are found to be the same, maintaining an overallinteger topological unit. By perturbing with external magnetic fields, we showthe robustness of these meron pairs and reveal a rich phase space to tune thehybridization between the ferromagnetic order and meron-like defects. Thesignatures of topological excitations under external magnetic field alsoprovide crucial information for experimental justifications. Our study predictsthat two-dimensional magnets with weak spin-orbit coupling can be a promisingfamily for realizing meron-like spin textures.

Meron-Like Topological Spin Defects in Monolayer CrCl3