Room-Temperature Skyrmionic Synapse in 2D Ferromagnet Fe3GaTe2 Operating via Collective Spin Texture Transformation

My Contribution

As co-first author on the theory side, I led the GPU-accelerated micromagnetic simulations using MUMAX3 to provide the theoretical foundation for the first artificial synaptic device based on a collective spin texture transformation in a 2D magnet at room temperature.

I successfully reproduced the experimentally observed current-driven skyrmion lattice → stripe domain phase transformation, and elucidated the microscopic mechanism as a thermodynamic relaxation process driven by demagnetization energy and assisted by spin-orbit torque injection. I tracked the evolution of topological charge from approximately −50 (dense skyrmion lattice) to −5 (stripe domains), providing quantitative evidence of skyrmion annihilation and stripe expansion. Critically, this analysis directly addressed key reviewer concerns by distinguishing between domain drift and true topological phase transition, confirming the non-volatility of the device operation.

The simulations incorporated SOT, STT, and finite-temperature thermal fluctuations via the Landau-Lifshitz-Gilbert equation with temperature-dependent material parameters scaled via phenomenological scaling laws.