Fig. 1: Schematic structure and stability.

a Schematic diagram of the element substitution from Mn₂Cl₂ monolayer to Janus Mn₂ClXH monolayer. b Phonon dispersion of Mn₂ClSeH monolayer. c Simulated Néel temperatures of Mn₂ClXH (X = O, S, and Se) monolayers.