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Movement of magnetic domain walls induced by single femtosecond laser pulses
Sandig, Oliver ;  Shokr, Y.A. ;  Vogel, J. ;  Valencia, S. ;  Kronast, Florian ;  Kuch, Wolfgang

HaupttitelMovement of magnetic domain walls induced by single femtosecond laser pulses
AutorSandig, Oliver
AutorShokr, Y.A.
AutorVogel, J.
AutorValencia, S.
AutorKronast, Florian
AutorKuch, Wolfgang
Seitenzahl7 S.
DDC530 Physik
Auch erschienen inPhysical Review B. - 94 (2016), 5, Artikel Nr. 054414
ZusammenfassungWe present a microscopic investigation of how the magnetic domain structure in ultrathin films changes after
direct excitation by single ultrashort laser pulses. Using photoelectron emission microscopy in combination with
x-ray magnetic circular dichroism in the resonant absorption of soft x rays, we find that individual laser pulses of
≈60 fs duration and a central wavelength of 800 nm lead to clear changes in the domain structure of a Co layer
of three atomic monolayers thickness in an epitaxial Co/Cu/Ni trilayer on a Cu(001) single-crystal substrate.
A relatively small enhancement of the sample base temperature by 40 K is sufficient to lower the threshold of
laser fluence for domain wall motion by about a factor of two. Pump-probe measurements with a laser fluence
just below this threshold indicate that the laser-induced demagnetization of the sample is far from complete
in these experiments. Although the domain wall motion appears similar to thermal domain wall fluctuations,
quantitatively it cannot be explained by pure thermal activation of domain wall motion by the transient rise of
sample temperature after the laser pulse, but it is likely to be triggered by a laser-induced depinning of domain
walls.
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Fachbereich/EinrichtungFB Physik
Arbeitsbereich/InstitutInstitut für Experimentalphysik
Erscheinungsjahr2016
Dokumententyp/-SammlungenWissenschaftlicher Artikel
SpracheEnglisch
RechteCopyright des Verlags
Erstellt am08.02.2017 - 00:00:00
Letzte Änderung08.02.2017 - 00:00:00
 
Statische URLhttp://edocs.fu-berlin.de/docs/receive/FUDOCS_document_000000026286
SEPID53743
ISSN2469-9950
DOI10.1103/PhysRevB.94.054414
Zugriffsstatistik
 

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