Accumulative magnetic switching of FePt granular media by circularly polarized light

摘要

Deterministic control of magnetization by light, often referred to as all-optical switching (AOS), is an attractive recording method because magnetization control becomes possible without the need of an external magnetic field. The first demonstration of AOS was in ferrimangnetic GdFeCo film where the Gd and FeCo spin sub-lattices are antiferromagnetically exchange coupled. Since the mechanism determined for GdFeCo films required antiparallel exchange of two sublattice systems, it was believed that AOS occurs only in ferrimagnetic materials including synthetic structures.