BEUTIER Guillaume

Chargé de Recherche CNRS

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

  1. 3D imaging of a dislocation loop at the onset of plasticity in an indented nanocrystal
    Abstract Image
  2. Band filling control of the Dzyaloshinskii-Moriya interaction in weakly ferromagnetic insulators
  3. Wetting layer of copper on the tantalum (001) surface
  4. Time-resolved imaging of magnetic vortex dynamics using holography with extended reference autocorrelation by linear differential operator
  5. Atomic structure of the i-R-Cd quasicrystals and consequences for magnetism
  6. Proton configurations in the hydrogen bonds of KH2PO4 as seen by resonant x-ray diffraction
  7. Ordering fluctuation dynamics in AuAgZn2
  8. Inversion Domain Boundaries in GaN Wires Revealed by Coherent Bragg Imaging
    Abstract Image
  9. Signature of dislocations and stacking faults of face-centred cubic nanocrystals in coherent X-ray diffraction patterns: a numerical study
  10. Diffuse Multiple Scattering
  11. Measuring the Dzyaloshinskii–Moriya interaction in a weak ferromagnet
  12. Antiferromagnetic order and the structural order-disorder transition in the Cd6Ho quasicrystal approximant
  13. Holographic imaging of interlayer coupling in Co/Pt/NiFe
  14. Strain inhomogeneity in copper islands probed by coherent X-ray diffraction
  15. Antiferromagnetic order in the quasicrystal approximant Cd6Tb studied by x-ray resonant magnetic scattering
  16. Direct Observation of Charge Order in Triangular Metallic AgNiO2 by Single-Crystal Resonant X-Ray Scattering
  17. Coherent scattering from silicon monocrystal surface
  18. Magnetic memory in discrete media observed by coherent soft x-ray resonant scattering
  19. Commensurate phase of multiferroic HoMn2O5 studied by x-ray magnetic scattering
  20. Characterization of FePd bilayers and trilayers using soft x-ray resonant magnetic scattering and micromagnetic modelling

Informations complémentaires

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).

INP-Grenoble (2005)