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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/EH22_010%2F0008820" target="_blank" >EH22_010/0008820: MSCA Fellowships CZ - UK3</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nano Letters

ISSN

1530-6984

e-ISSN

1530-6992

Svazek periodika

25

Číslo periodika v rámci svazku

44

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

15978-15984

Kód UT WoS článku

001599106000001

EID výsledku v databázi Scopus

2-s2.0-105020955724