  All optical magnetic switching (AOS) is a recently observed rich and puzzling
phenomenon that offers promis- ing technological applications. However,
fundamental understanding of the underlying mechanisms remains elusive. Here we
present a new model for multi-shot helicity-dependent AOS in ferromagnetic
materials based on a purely heat-driven mechanism in the presence of Magnetic
Circular Dichroism (MCD). We predict that AOS should be possible with as little
as 0.5% of MCD, after a minimum number of laser shots. Finally, we re- produce
previous AOS results by simulating the sweeping of a laser beam on an FePtC
granular ferromagnetic film.
