Fig. 1.

Illustration of the X-ray scattering geometry and magnetization dynamics after substrate resonant mid-IR excitation. Vibrations of the LAO lattice induced by mid-IR radiation lead to a demagnetization front propagating from the interface. The noncollinear AFM structure of Ni along the [111] direction of the NNO film is shown in the top surface of the unperturbed region. The diffraction measurements were made on the front surface of the film with the incident and exiting waves illustrated as yellow stripes and the θ-scattering angle indicated. In this orientation of the NNO film, the ψ-angle is zero, as the projection of the incident X-ray beam into the surface plane is along [−1−12].