Fig. 2 Reservoirs and channels for spin angular momentum loss. Reservoirs and channels for spin angular momentum loss. (A) Evolution of magnetic moment per atom for Ni bulk under six different cases: original linear polarization laser simulation, linear polarization laser without the σ ⋅ B term in Eq. 1, linear polarization laser with fixing atoms, left circular polarization laser, and linear and left circular polarization laser without the SOC term in Eq. 1. The polarization direction of all the light is perpendicular to the magnetization. (B) Change of electron spin angular momentum Se, electron orbital angular momentum Le, ion angular momentum Lion, and their total angular momentum (all in the z direction) for Ni dimer. (C) Schematic of reservoirs and interactions for spin demagnetization. Zhanghui Chen, and Lin-Wang Wang Sci Adv 2019;5:eaau8000 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).