Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session E19: Ultrafast Magnetism and Switching
8:00 AM–11:00 AM,
Tuesday, March 6, 2018
LACC
Room: 308A
Sponsoring
Units:
GMAG DMP FIAP
Chair: Ezekiel Johnston-Halperin, Ohio State University
Abstract ID: BAPS.2018.MAR.E19.11
Abstract: E19.00011 : Time-dependent Liouville density functional investigation of ultrafast demagnetization*
10:48 AM–11:00 AM
Presenter:
Guoping Zhang
(Indiana State Univ)
Authors:
Guoping Zhang
(Indiana State Univ)
Yihua Bai
(Indiana State Univ)
Thomas George
(University of Missouri-St. Louis)
(1) and 4f metals (2) has been a focus of investigation over a
decade. However, to describe it theoretically has been challenging.
We apply our newly-developed time-dependent Liouville density
functional theory (3,4) to both transition metals and rare-earth
metals and find it very successful. The theory shows that with a
strong laser field, the demagnetiation time becomes longer, and both
the majority and minority bands are shifted. In rare-earth metails,
it yields the exchange interaction shift which matches the
experimental results semi-quantitatively. For thin films, the
demagnetization indeed becomes stronger. This matches the
time-dependent density functional theory results, but obeys the Pauli
exclusion principle. We also find that the spin transport effect is
very weak in ferromagnetic nickel (5).
(1) E. Beaurepaire, J.-C. Merle, A. Daunois, and J.-Y. Bigot, Phys.
Rev. Lett. 76, 4250 (1996).
(2) M. Lisowski, P. A. Loukakos, A. Melnikov, I. Radu, L. Ungureanu,
M. Wolf, and U. Bovensiepen, PRL 95, 137401 (2005).
(3) G. P. Zhang et al,
PRB 96, 134407 (2017).
(4) G. P. Zhang, et al. J. Phys.: Condens. Mat. 27, 236004 (2016).
(5) V. Shokeen, et al. , PRL 119, 107203 (2017).
*U.S. Department of Energy, DE-FG02-06ER46304 No. DE-AC02-05CH11231.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.E19.11
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