The role of ultrafast magnon generation in the magnetization dynamics of rare-earth metals
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10417723" target="_blank" >RIV/00216208:11320/20:10417723 - isvavai.cz</a>
Alternative codes found
RIV/61989100:27740/20:10245531
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=I4d8r1DhBn" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=I4d8r1DhBn</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1126/sciadv.abb1601" target="_blank" >10.1126/sciadv.abb1601</a>
Alternative languages
Result language
angličtina
Original language name
The role of ultrafast magnon generation in the magnetization dynamics of rare-earth metals
Original language description
Ultrafast demagnetization of rare-earth metals is distinct from that of 3d ferromagnets, as rare-earth magnetism is dominated by localized 4f electrons that cannot be directly excited by an optical laser pulse. Their demagnetization must involve excitation of magnons, driven either through exchange coupling between the 5d6s-itinerant and 4f-localized electrons or by coupling of 4f spins to lattice excitations. Here, we disentangle the ultrafast dynamics of 5d6s and 4f magnetic moments in terbium metal by time-resolved photoemission spectroscopy. We show that the demagnetization time of the Tb 4f magnetic moments of 400 fs is set by 4f spin-lattice coupling. This is experimentally evidenced by a comparison to ferromagnetic gadolinium and supported by orbital-resolved spin dynamics simulations. Our findings establish coupling of the 4f spins to the lattice via the orbital momentum as an essential mechanism driving magnetization dynamics via ultrafast magnon generation in technically relevant materials with strong magnetic anisotropy.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Science advances [online]
ISSN
2375-2548
e-ISSN
—
Volume of the periodical
6
Issue of the periodical within the volume
39
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
eabb1601
UT code for WoS article
000575531700017
EID of the result in the Scopus database
2-s2.0-85091541022