  We explore the impact of optical excitation using two interfering ultrashort
optical pulses on ultrafast magnetization dynamics. Our investigation focuses
on Pt/Co/Pt multilayers and TbCo alloy samples, employing a dual pump approach.
We observe significant variations in the dynamics of magnetization suppression
and subsequent recovery when triggered with two optical pulses of the same
polarization-essentially meeting conditions for interference. Conversely,
dynamics triggered with cross-polarized pump beams exhibit expected similarity
to that triggered with a single pulse. Delving into the underlying physical
processes contributing to laser-induced demagnetization and recovery dynamics,
we find that our current understanding cannot elucidate the observed trends.
Consequently, we propose that optical excitation with interfering light
possesses not previously acknowledged capacity to induce long-lasting
alterations in the dynamics of angular momentum.
