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We study the demagnetization dynamics of the fully compensated half-metallicferrimagnet Mn$_2$Ru$_x$Ga. While the two antiferromagnetically coupledsublattices are both composed of manganese, they exhibit different temperaturedependencies due to their differing local environments. The sublatticemagnetization dynamics triggered by femtosecond laser pulses are studied toreveal the roles played by the spin and intersublattice exchange. We find atwo-step demagnetization process, similar to the well-established case ofGd(FeCo)$_3$, where the two Mn-sublattices have different demagnetizationrates. The behaviour is analysed using a four-temperature model, assigningdifferent temperatures to the two manganese spin baths. Even in this stronglyexchange-coupled system, the two spin reservoirs have considerably differentbehaviour. The half-metallic nature and strong exchange coupling ofMn$_2$Ru$_x$Ga lead to spin angular momentum conservation at much shorter timescales than found for Gd(FeCo)$_3$ which suggests that low-power,sub-picosecond switching of the net moment of Mn$_2$Ru$_x$Ga is possible.

Sub-picosecond exchange-relaxation in the compensated ferrimagnet Mn$_2$Ru$_x$Ga