  Laser-induced ultrafast (fs) magnetization experiments in antiferromagnets
have recently attracted large attention, paving the road for inherently fast
spin dynamics in the THz regime without invoking stray fields. The technical
importance is emphasized by the rising new research field of antiferromagnetic
(AFM) spintronics, where superexchange-dominated strongly correlated compounds
provide an interesting materials playground. An intriguing question is whether
the Coulomb interaction may be a key to control AFM order on ultrafast time
scales. Therefore, we study (de)magnetization processes in a time-dependent
multiorbital Hubbard model, focusing on $t_{2g}$ electrons in a wider doping
range. Depending on filling, we reveal large-amplitude spin oscillations via
interaction quenches from the antiferromagnetic or paramagnetic state.
Nonequilibrium ultrafast spin-orientation effects in prominent correlated
transition-metal oxides are therefrom predicted.
