| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Vodungbo, Boris
Sorbonne Université
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2022Ultrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray sourcecitations
- 2020Multi-color imaging of magnetic Co/Pt heterostructures
- 2017Multi-color imaging of magnetic Co/Pt heterostructurescitations
- 2017Multi-color imaging of magnetic Co/Pt heterostructurescitations
- 2008Growth and structural analysis of diluted magnetic oxide Co-doped CeO2−δ films deposited on Si and SrTiO3 (1 0 0)citations
- 2008Magnetic and structural properties of MnAs thin films on GaAs(111)B: Influence of the growth temperaturecitations
- 2008Structural, magnetic and spectroscopic study of a diluted magnetic oxide: Co doped CeO2−δcitations
- 2007Room temperature ferromagnetism of Co doped CeO2-delta diluted magnetic oxide: Effect of oxygen and anisotropycitations
- 2007Planar assembly of monodisperse metallic cobalt nanoparticles embedded in TiO2-delta matrixcitations
Places of action
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article
Ultrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray source
Abstract
International audience ; Development of ultrafast table-top x-ray sources that can map various spin, orbital, and electronic configurations and reordering processes on their natural time and length scales is an essential topic for modern condensed matter physics as well as ultrafast science. In this work, we demonstrate spatiotemporally resolved resonant magnetic scattering (XRMS) to probe the inner-shell 4d electrons of a rare-earth (RE) composite ferrimagnetic system using a bright > 200 e V soft x-ray high harmonic generation (HHG) source, which is relevant for future energy-efficient, high-speed spintronic applications. The XRMS is enabled by direct driving of the HHG process with power-scalable, high-energy Yb laser technology. The optimally phase-matched broadband plateau of the HHG offers a record photon flux ( > 2 × 1 0 9 p h o t o n s / s / 1 % bandwidth) with excellent spatial coherence and covers the entire resonant energy range of RE’s N 4 , 5 edges. We verify the underlying physics of our x-ray generation strategy through the analysis of microscopic and macroscopic processes. Using a CoTb alloy as a prototypical ferrimagnetic system, we retrieve the spin dynamics, and resolve a fast demagnetization time of 500 ± 126 f s , concomitant with an expansion of the domain periodicity, corresponding to a domain wall velocity of ∼ 750 m / s . The results confirm that, far from cross-contamination of low-energy absorption edges in multi-element systems, the highly localized states of 4 d electrons associated with the N 4 , 5 edges can provide high-quality core-level magnetic information on par with what can be obtained at the M edges, which is currently accessible only at large-scale x-ray facilities. The analysis also indicates the rich material-, composition-, and probing-energy-dependent driving mechanism of RE-associated multicomponent systems. Considering the rapid emergence of high-power Yb lasers combined with novel nonlinear compression technology, this work indicates potential for ...