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Manipulation of the intersublattice interaction strengh (JRE-TM) in rareearth (RE)-transition metal (TM) alloys is a key issue to understand howefficiently the laser-induced angular momentum transfers from 3d to 4f spinsand to have a better control of the ultrafast spin dynamics. In this work, therelationships between laser-induced demagnetization process and theintersublattice 3d-4f interaction for the GdCoFe alloys were systematicallystudied. The ultrafast two-stage demagnetization process could change into aone-stage mode as the angular momentum transferring channel between 3d and 4fspins is switched off, which could be modulated by JRE-TM. Furthermore, boththe effective g-factor and damping constant deduced by the subsequentlylaser-induced magnetization precession process diverge at the angular momentumcompensation point based on the ferromagnetic resonance method with the LLGequations. The results provide an alternative way to efficiently manipulate theultrafast demagnetization time for practical applications.

Strongly modulated ultrafast demagnetization and magnetization  precession dynamics in ferrimagnetic Gdx(CoFe)1-x alloys via 3d-4f  intersublattice exchange coupling