  The existence of spontaneous magnetization that fingerprints a ground-state
ferromagnetic order was recently observed in two-dimensional (2D) van der Waals
materials. Despite progress in the fabrication and manipulation of the
atom-thick magnets, investigation of nanoscale magnetization properties is
still challenging due to the concomitant technical issues. We propose a
promising approach for a direct visualization of the domain walls formed in 2D
magnetic materials. By interfacing 2D magnet with a transition metal
dichalcogenide (TMD) monolayer, the strong proximity effects enable pinning the
TMD excitons on the domain wall. The emergent localization stems from the
proximity-induced exchange mixing between spin-dark and spin-bright TMD
excitons due to the local in-plane magnetization characteristic of the domain
wall in the magnetic monolayer.
