Laser-Induced Topological Toggle Switching at Room Temperature in the van der Waals Ferromagnet Fe3GaTe2

My Contribution

I simulated the thermodynamics of topological switching in Fe₃GaTe₂ using micromagnetic simulations (MUMAX3). I demonstrated the critical interplay between thermal fluctuations and external magnetic fields in the formation and deformation of skyrmion bubbles, successfully validating the underlying mechanism for all-optical toggle switching.

My simulations confirmed that the process is enabled by laser-induced heating followed by the rapid quenching of magnetic order, which allows the system to access the skyrmion bubble phase at substantially lower applied fields (~5 mT) compared to conventional slow field-cooling protocols (~32–55 mT). I reproduced the key experimental observations including reversible switching between labyrinth domain and skyrmion bubble states, and mapped the topological charge as a function of applied field during the switching process.