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Ultrafast magnetiza...
Ultrafast magnetization dynamics in magnetically frustrated NiFe2O4 ferrimagnet
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- Malik, Rameez Saeed, 1987- (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Knut, Ronny (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Kvashnin, Yaroslav (author)
- Uppsala universitet,Materialteori
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- Stefanuik, Robert (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Söderström, Johan, 1978- (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Karis, Olof (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Thonig, Danny, 1986- (author)
- Örebro University
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- Eriksson, Olle, 1960- (author)
- Uppsala universitet,Materialteori
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- Arena, Dario (author)
- Department of Physics, University of South Florida
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(creator_code:org_t)
- English.
- Related links:
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https://urn.kb.se/re...
Abstract
Subject headings
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- NiFe2O4 shows complex dynamics between its elements after an ultrashort laser pulse excitation. The reflectivity shows oscillations, indicating either a reordering of the charge distribution several picoseconds after absorption of the laser pulse or a coherent phonon mode with a frequency of 0.5 THz. Also, the magnetic asymmetry exhibits oscillations that cannot be attributed to transverse magnetic excitations (magnons) but correspond to longitudinal excitations. The demagnetization shows different behavior depending on the excitation photon energy, for energies close to the band gap (1.55 eV) oscillations in the asymmetry are prominent, while for higher energies (3.1 eV) the demagnetization becomes dominant and the oscillations vanish. A fast demagnetization is observed when using 3.1 eV compared to 1.55 eV, while the electronic response remains similar, which indicates that the fast demagnetization dynamics is driven by holes created deeper in the valence band while the dynamics of electrons excited to d-states in the conduction band provides a smaller contribution to the demagnetization.The oscillations in the asymmetry can be a consequence of the competing exchange interactions that are antiferromagnetic between all three sublattices, but where a ferromagnetic alignment between octahedral Ni and octahedral Fe is the ground state.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Magnetic insulator
- Time-resolved dynamics
- ultrashort pulses
- Physics with spec. in Atomic, Molecular and Condensed Matter Physics
- Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
- Physics with spec. in Atomic, Molecular and Condensed Matter Physics
- Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
- Physics with spec. in Atomic, Molecular and Condensed Matter Physics
- Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
Publication and Content Type
- pop (subject category)
- ovr (subject category)
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- By the author/editor
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Malik, Rameez Sa ...
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Knut, Ronny
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Kvashnin, Yarosl ...
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Stefanuik, Rober ...
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Söderström, Joha ...
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Karis, Olof
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Thonig, Danny, 1 ...
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Eriksson, Olle, ...
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Arena, Dario
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- By the university
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Uppsala University