Ultrafast Spin Dynamics beyond s-Wave Magnets: A Universal Polarization Dependence

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F25%3A10505293" target="_blank" >RIV/00216208:11310/25:10505293 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=~EOa0Sz5-X" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=~EOa0Sz5-X</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.nanolett.5c04475" target="_blank" >10.1021/acs.nanolett.5c04475</a>

Result language
angličtina
Original language name
Ultrafast Spin Dynamics beyond s-Wave Magnets: A Universal Polarization Dependence
Original language description
Symmetry and hybridization yield anisotropic but nodal-less Fermi surfaces in s-wave ferromagnets (FMs) and antiferromagnets (AFMs), while they produce distinct momentum-space nodes in altermagnets (AMs). Both drive anisotropic femtosecond magnetization dynamics, but this link remains little explored. Here, we investigate laser-driven ultrafast spin dynamics in FMs, AFMs, and AMs with varying polarization angles using time-dependent density functional theory. We demonstrated, in FMs and AFMs, that laser polarization controls the amplitude of anisotropic yet symmetric demagnetization. In contrast, AMs-featuring spin nodal structures-exhibit sublattice-asymmetric demagnetization that is highly sensitive to laser incidence. This behavior arises from the anisotropy of the Fermi surface and band dispersion, which governs optical-induced intersite spin transfer (OISTR). We proposed a unified framework using the band-path-resolved local density of states to understand anisotropic OISTR and its impact on spin dynamics. Our results establish a direct connection between polarization-dependent ultrafast spin responses and the anisotropic electronic structure of materials.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10403 - Physical chemistry

Project
<a href="/en/project/EH22_010%2F0008820" target="_blank" >EH22_010/0008820: MSCA Fellowships CZ - Charles University 3</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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