Extended Data Fig. 10: Additional molecular dynamics simulations results.
From: Polarized phonons carry angular momentum in ultrafast demagnetization
a, Finite-size effects of the anisotropy of crystallographically equivalent peaks comparing open boundary conditions (OBC) with periodic ones (PBC). For OBC a finite-size effect is observed: the relaxation time of the contrast increases with system size. PBC do not show this effect. b, Long-time evolution for N = 50 testing the three cases (OBC, PBC, and global rotation according to the Einstein–de Hass effect (EdH)) (blue, solid lines). Also shown is the anisotropy of the mean-squared velocities \(2{v}_{y}^{2}/({v}_{x}^{2}+{v}_{z}^{2})\) (green, dotted lines). c, Temperature dependence; anisotropy of crystallographically equivalent peaks for the same angular momentum L0 (same demagnetization) but different energy transfers to the lattice, leading to a temperature increase of ΔT = 15 K and 60 K, respectively.
