My research projects focus on the development of advanced X-ray diffraction techniques using synchrotron radiation and using them for various problems of condensed matter physics.
Recent projects deal with:
- Imaging of strain and defects in nanocrystals using Coherent Bragg Imaging, in particular for the understanding of mechanical properties at the nanoscale. Recently we imaged for the first time a dislocation loop in a gold nanocrystal during in situ nanoindentation.
- A fundamental study of crystallographic "forbidden" reflections, their enhancement with resonant X-rays, and the information they provide on the local anisotropy of the resonant atoms. Recently we characterized the Dzyaloshinskii-Moriya interaction (antisymmetric exchange coupling) in a series of weak ferromagnets.
- Quasicrystals and their periodic approximants. Recently we characterized the long range antiferromagnetic order in the series Cd6R (R=Rare-Earth) of approximants. They are of noteworthy interest, since the parent quasicrystals do not show long renage magnetic order.
- The development of a magnetic microscopy method using a combination of Fourier Transform Holography and X-ray Magnetic Circular Dichroism, to image complex micromagnetic configurations in nanostructures.
Activités / CV
Selected publications
- 3D imaging of a dislocation loop at the onset of plasticity in an indented nanocrystal
- Band filling control of the Dzyaloshinskii-Moriya interaction in weakly ferromagnetic insulators
- Wetting layer of copper on the tantalum (001) surface
- Time-resolved imaging of magnetic vortex dynamics using holography with extended reference autocorrelation by linear differential operator
- Atomic structure of the i-R-Cd quasicrystals and consequences for magnetism
- Proton configurations in the hydrogen bonds of KH2PO4 as seen by resonant x-ray diffraction
- Ordering fluctuation dynamics in AuAgZn2
- Inversion Domain Boundaries in GaN Wires Revealed by Coherent Bragg Imaging
- Signature of dislocations and stacking faults of face-centred cubic nanocrystals in coherent X-ray diffraction patterns: a numerical study
- Diffuse Multiple Scattering
- Measuring the Dzyaloshinskii–Moriya interaction in a weak ferromagnet
- Antiferromagnetic order and the structural order-disorder transition in the Cd6Ho quasicrystal approximant
- Holographic imaging of interlayer coupling in Co/Pt/NiFe
- Strain inhomogeneity in copper islands probed by coherent X-ray diffraction
- Antiferromagnetic order in the quasicrystal approximant Cd6Tb studied by x-ray resonant magnetic scattering
- Direct Observation of Charge Order in Triangular Metallic AgNiO2 by Single-Crystal Resonant X-Ray Scattering
- Coherent scattering from silicon monocrystal surface
- Magnetic memory in discrete media observed by coherent soft x-ray resonant scattering
- Commensurate phase of multiferroic HoMn2O5 studied by x-ray magnetic scattering
- Characterization of FePd bilayers and trilayers using soft x-ray resonant magnetic scattering and micromagnetic modelling
PhD thesis
Étude de nanostructures magnétiques par diffraction résonnante et cohérente de rayons X mous.
(Magnetic nanostructures studied by soft x-ray resonant and coherent scattering).
http://tel.archives-ouvertes.fr/tel-00108493
INP-Grenoble (2005)
