A GdFe ferrimagnet can be toggled back by a second, weaker laser pulse arriving 3 to 4 picoseconds after the first, a speed record for this material.
Exchange-enhancement of the ultrafast magnetic order dynamics in antiferromagnets
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abstract
We theoretically demonstrate that the ultrafast magnetic order dynamics in antiferromagnets is exchange-enhanced in comparison to their ferromagnetic counterparts. We provide an equation of motion for the magnetic order dynamics validated by computer simulations using atomistic spin dynamics methods. The exchange of angular momentum between sublattices speeds up the dynamics in antiferromagnets, a process absent in ferromagnets.
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Studying all-optical magnetization switching of GdFe by double-pulse laser excitation
A GdFe ferrimagnet can be toggled back by a second, weaker laser pulse arriving 3 to 4 picoseconds after the first, a speed record for this material.