Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session W50: Spin Dynamics, Topology and Damping
3:00 PM–5:24 PM,
Thursday, March 17, 2022
Room: McCormick Place W-474A
Sponsoring
Units:
GMAG DMP FIAP
Chair: Gen Yin, Georgetown University
Abstract: W50.00004 : How spin and orbital angular momenta are correlated during laser-induced ultrafast demagnetization*
4:24 PM–4:36 PM
Presenter:
Guoping Zhang
(Indiana State University)
Authors:
Guoping Zhang
(Indiana State University)
Mingqiang Gu
(Southern University of Science and Technology)
Yihua Bai
(Indiana State University)
Thomas F George
(University of Missouri - St. Louis)
It is very well known that there is some degree of correlation
between spin and orbital degrees of freedom during laser-induced
ultrafast demagnetization. What is unknown or less clear is how
they are correlated. The experiments now have accumulated rich
sets of data from different types of materials, from 3d
transition ferromagnets to rare-earth materials. Here, we use
time-dependent Liouville density functional theory and regular
TDDFT methods to demonstrate clearly that this correlation
exists. Due to spin-orbit coupling, the spin is dragged by the
orbital. In all the six systems that we investigated, we find
this correlation is element-specific. This information is crucial
to understanding demagnetization. As researchers shift their
views toward phonon-based demagnetization mechanisms, we are
reminded that there are still much more important issues
overlooked so far. If the phonon angular momentum transfer is
important, then it must show up in the spin-orbital correlation
diagram.
*This work was supported by the U.S. Department of Energy underContract No. DE-FG02-06ER46304. Part of the work was done on IndianaState University's high performance Quantum and Obsidian clusters.The research used resources of the National Energy Research ScientificComputing Center, which is supported by the Office of Science of theU.S. Department of Energy under Contract No. DE-AC02-05CH11231.
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