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Ligne de lumière DEIMOS
La recherche scientifique à SOLEIL > Lignes de lumière > DEIMOS
Description Technical data
Scientific Opportunities Contacts
Employment Beamline progress

Description
DEIMOS, Dichroism Experimental Installation for Magneto-Optical Spectroscopy, is a beam-line dedicated to the study of the magnetic and electronic properties using polarized light. The application of synchrotron radiation to magnetism is related to the development of circularly polarized sources. The main advantage of X-ray Magnetic Circular Dichroism (XMCD) over other techniques addressing magnetic behavior lies in its chemical and orbital selectivity. One can probe the magnetic moment of one specific atom in a compound in which the absorbing atom is not a major component. Due to the electric dipole nature of the Hamiltonian interaction, one can also probe specific shells for which the magnetic orbital and magnetic spin moments can be “independently” measured. New physical and chemical properties shown by different classes of materials provide the basis for promising applications and challenging scientific investigations. The knowledge of the electronic structure of these materials is of crucial importance for the understanding and tailoring of well defined properties, like transport, magnetism and others.
 
Technical data
Energy range
 		   350 – 2500 eV
Energy resolution   E/ΔE between 6000 and 10000 over the whole energy range
 
Source
 		   1st - APPLE II HU52
2nd - EMPHU65 with a polarization switching rate of 10Hz
 
Flux on the first optics   ~ 2x1015 phot/s/0.1%bw @ 750eV
 
Optics   Double mirror (2 mirrors with 2 incidence angles, insuring a good harmonic rejection over the entire energy range);
 
PGM with VGD gratings (1200 and 1600 lines) working in the Petersen mode + multilayer gratings for the “high” energy range (>1500eV);
 
Post-focusing Wolter system.
 
The optics design is intended to give high stability and high spectral purity.
 
Sample environment
 		   MBE chamber with preparation (Ar+ etching gun, heating up to 1500K, evaporation – EFM3, EFM3T) and analysis (LEED, AES) facilities;
 
small preparation chamber connected directly with the 7T cryo-magnet to allow fast sample introduction in UHV through a load-lock or fast sample preparation;
 
Cryo-magnet: 7T (along the beam direction)+2T (perpendicular on the beam) and 1.5K (at the sample);
 
Sample holders and transfer system compatible with Omicron standards.
Beam size at sample   30x30µm2 with defocusing possibility (using 2 mirrors stages in the Wolter system).
 
Flux on the sample   ~ 6x1012 phot/s/0.1%bw @ 750eV
 
Detectors
 		   Absorption in TEY (Total Electron Yield) and FY (Fluorescence Yield) modes.
Polarization   Variable polarization (circular, continuous linear). EMPHU65 will give 10Hz switching rate between circular left and right polarizations.
 
Scientific Opportunities
Surface and interface
magnetism, Materials
for spin electronics		   Magnetic properties of low dimensional structures – size effects; correlation between magnetic properties, morphology and structure - magnetoelastic effects, contributions in the magnetic anisotropy; magnetic moments and anisotropy of isolated atoms - tunneling surface diffusion at very low temperatures; ferromagnetic-antiferromagnetic interfaces – origin of the exchange coupling; magnetic tunnel junctions; etc.
 
Molecular magnets,
Langmuir-Blodgett films,
Hybrid magnetic materials,
High spin molecules		  

Magnetic and electronic properties of pure molecular magnets (dichroism of small magnetic polarization of the NO groups, with site selectivity); organo-metallic compounds and supramolecular assemblies – large variety of magnetic structures tuning chemical properties, “exotic” magnetic structures and mechanisms; lamellar compounds – ferrimagnetism, magnetic frustration; polynuclear molecules with monodisperse magnetic properties (moments and anisotropy) – molecular electronics, q-bits.
 
Superparamagnetic
nanoparticles,
Earth Science,
Paleomagnetism		   Magnetic properties of variously synthesized particles of magnetite (Fe3O4), maghemite ((γ-Fe2O3), hematite (α-Fe2O3), pyrrhotite (Fe1-xS) or greigite (Fe3S4) - magnetic surface canting, chemical and magnetic disorder, vacancies ordering.
 
Beamline Status : Operational 1st term 2010.
Contacts

Philippe OHRESSER
(Principal beamline scientist)

Tel:+33(0)1 69 35 96 82
Fax:+33(0)1 69 35 94 56

philippe.ohresser@synchrotron-soleil.fr

Stefan STANESCU
(Beamline scientist)

Tel:+33(0)1 69 35 96 98
Fax:+33(0)1 69 35 94 56

stefan.stanescu@synchrotron-soleil.fr

Edwige OTERO
(Beamline scientist)

Tel:+33(0)1 69 35 80 91
Fax:+33(0)1 69 35 94 56

edwige.otero@synchrotron-soleil.fr

Françoise DESCHAMPS
(Beamline assistant engineer)

  Tel:+33(0)1 69 35 97 01
Fax:+33(0)1 69 35 94 56		 francoise.deschamps@synchrotron-soleil.fr
Beamline
Tel:+33(0)1 69 35 81 52
Tel:+33(0)1 69 35 81 51		  
Synchrotron SOLEIL
L'orme des Merisiers
Saint-Aubin - BP48
91192 GIF-sur-YVETTE CEDEX
  		   
Employment
Click here to access to the SOLEIL employment web page

 Publications de la ligne

 Actualités :

- Etude des nanostructures magnétiques par dichroïsme circulaire

 Informations générales :

  Preliminary project

Notice 

 Télécharger le schéma
des domaines d'énergie

Beamline progress

Events

Workshop

X Ray Spectroscopy

in High Magnetic Field


November 16th - 17th, 2010

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