Fig. 2
From: Beyond a phenomenological description of magnetostriction
Ultrafast spin and lattice dynamics of the FePt nanoparticles. a Experimental setup for time-resolved soft X-ray scattering measurements of the FePt magnetization dynamics. b The measured change in magnetization for a laser pump fluence of 9.5 mJ/cm2. The solid line is a two-exponential fit to the data showing a 146 ± 15 fs drop followed by a 16 ± 4 ps recovery of the magnetization. The inset shows the size of the magnetization drop vs. pump fluence. c Experimental setup for ultrafast electron diffraction measurements of the time-resolved structural response of the FePt nanoparticles. d Measurements of the Bragg diffraction are used to determine the temporal evolution of the a-, b-lattice (red squares) and c-lattice (blue circles) spacings for a pump laser fluence of 5.0 mJ/cm2. The solid lines are fits of a simple driven coupled harmonic oscillator (CHO) model to the data as described in the text
