Non-equilibrium magnetic fields in ab initio spin dynamics
Mesoscale and Nanoscale Physics
2017-01-18 v2 Materials Science
Abstract
Starting from the continuity equation for the magnetization in time-dependent spin-density functional theory, we derive an expression for the effective time-dependent magnetic fields driving the out-of-equilibrium spin dynamics in magnetic systems. We evaluate these, so called, kinetic magnetic fields in the ultrafast demagnetization response to optical pulse excitations of ferromagnetic iron-based materials, namely Fe cluster and bulk bcc Fe. We identify spatial "hot spots" where the demagnetization is particularly enhanced as a result of the increased kinetic torque.
Cite
@article{arxiv.1604.06262,
title = {Non-equilibrium magnetic fields in ab initio spin dynamics},
author = {Jacopo Simoni and Maria Stamenova and Stefano Sanvito},
journal= {arXiv preprint arXiv:1604.06262},
year = {2017}
}
Comments
8 pages, 5 figures version 02 theory section and appendix modified, results unchanged