Figure 1: Experimental set-up and the microscopic model.
From: Ultrafast angular momentum transfer in multisublattice ferrimagnets
(a) Scheme of the X-ray transmission experiment using an infrared laser pump and X-ray probe configuration. The external magnetic field is applied parallel to the incoming X-rays. (b) Sketch of the time evolution of the pump-induced atomic magnetization dynamics on the exchange-coupled Co and RE in the ferrimagnetic multisublattice. Ultrafast dynamics of Ji(t) for each element is illustrated and start at the temporal overlap t0=0. At any time, both elements are exchange coupled and show antiferromagnetic order, attesting that we do not cross the compensation temperature Tcomp. During the demagnetization, a coupling between the two angular momenta may exist in the ferrimagnet.
