Journal Article

PUBDB-2024-01687

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Real-time observation of non-equilibrium phonon-electron energy and angular momentum flow in laser-heated nickel

Shokeen, V.Extern*XFEL.EU* ; Heber, M.XFEL.EU*DESY* ; Kutnyakhov, D.XFEL.EU*DESY* ; Wang, X.Extern* ; Yaroslavtsev, A.Extern*XFEL.EU* ; Maldonado, P. ; Berritta, M. ; Wind, N.DESY* ; Wenthaus, L.DESY* ; Pressacco, F.XFEL.EU*DESY* ; Min, C.-H.Extern* ; Nissen, M.Extern* ; Mahatha, S. K.Extern* ; Dziarzhytski, S.DESY* ; Oppeneer, P. M.Extern*XFEL.EU* ; Rossnagel, K.DESY* ; Elmers, H.-J.Extern* ; Schoenhense, G.Extern* ; Duerr, H. (Corresponding author)Extern*

2024
Assoc. Washington, DC [u.a.]

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Please use a persistent id in citations: doi:10.1126/sciadv.adj2407  doi:10.3204/PUBDB-2024-01687

Abstract: Identifying the microscopic nature of non-equilibrium energy transfer mechanisms among electronic, spin, and lattice degrees of freedom is central to understanding ultrafast phenomena such as manipulating magnetism on the femtosecond timescale. Here, we use time- and angle-resolved photoemission spectroscopy to go beyond the often-used ensemble-averaged view of non-equilibrium dynamics in terms of quasiparticle temperature evolutions. We show for ferromagnetic Ni that the non-equilibrium electron and spin dynamics display pronounced variations with electron momentum, whereas the magnetic exchange interaction remains isotropic. This highlights the influence of lattice-mediated scattering processes and opens a pathway toward unraveling the still elusive microscopic mechanism of spin-lattice angular momentum transfer.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)
3. Soft X-Ray Port (XFEL_E2_SXP)
4. FS-SXQM (FS-SXQM)
5. Laser Forschung und Entwicklung (FS-LA)
6. FLASH Photonen-Strahlführungen und Optiken (FS-FLASH-B)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)

Experiment(s):

1. FLASH Beamline PG2 (FLASH)

Appears in the scientific report 2024

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Database coverage:
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