A microscopic model for ultrafast remagnetization dynamics
Abstract
In this letter, we provide a microscopic model for the ultrafast remagnetization of atomic moments already quenched above Stoner-Curie temperature by a strong laser fluence. Combining first principles density functional theory, atomistic spin dynamics utilizing the Landau-Lifshitz-Gilbert equation and a three temperature model, we show the temporal evolution of atomic moments as well as the macroscopic magnetization of bcc Fe and hcp Co covering a broad time scale, ranging from femtoseconds to picoseconds. Our simulations show a variety of complex temporal behavior of the magnetic properties resulting from an interplay between electron, spin and lattice subsystems, which causes an intricate time evolution of the atomic moment, where longitudinal and transversal fluctuations result in a macro spin moment that evolves non-monotonically.
Cite
@article{arxiv.1210.2616,
title = {A microscopic model for ultrafast remagnetization dynamics},
author = {Raghuveer Chimata and Anders Bergman and Lars Bergqvist and Biplab Sanyal and Olle Eriksson},
journal= {arXiv preprint arXiv:1210.2616},
year = {2015}
}
Comments
8 pages including supplementary information, 5 figures including 2 supplementary figures. To appear in Physical Review Letters