PR Fraile Rodriguez

Slide1: 

X-ray Imaging and Spectroscopy of Individual Nanoparticles A. Fraile Rodríguez, F. Nolting Swiss Light Source Paul Scherrer Institut, Switzerland J. Bansmann Dept of Surface Chemistry and Catalysis Universität Ulm, Germany A. Kleibert Institut für Physik, Universität Rostock, Germany U. Wiedwald Dept of Solid State Physics Universität Ulm, Germany

Slide3: 

Superparamagnetism

Slide5: 

Single Particle experiments: Correlate the electronic, magnetic and structural properties with the size, aspect ratio, crystalline structure, and chemical composition of each individual particle. The ability to manipulate a single nanoparticle has an increased potential in device manufacturing

Slide6: 

Single Particle Detection: Techniques Available

Slide7: 

chemical bonding electronic properties

Slide8: 

Soft x-ray Spectromicroscopy Element specific imaging: PEEM Substrate Py Co Co islands, 778.1 eV Py film, 852.7 eV 5 m

Slide9: 

X-ray PhotoEmission Electron Microscopy probing secondary/Auger/photoemission spatial resolution: 50 nm electron energy resolution: 0.1 eV HA~ 30 mT 100 K < T < 1500 K ultra high vacuum

Slide11: 

Particle Size: Scanning Electron Microscopy deposition of Co particles on Si substrates coverage: 5-10 particles/m2 lithographic markers on substrates low percentage dimers/trimers crystalline structure Co particles, Al capping layer Co particles, no capping layer D ~10 nm D ~ 8 nm Lithographic markers: L. J. Heyderman, PSI

Slide12: 

Elemental Contrast: X-ray PEEM Co particles D  13 nm oxidized in air

Slide14: 

770 775 780 790 795 800 805 810 Photon Energy (eV) Movie: 159 images Total acquisition time: 12 hours. Individual Particles: X-ray Absorption Spectra Co particles D  8 nm, no capping layer

Slide17: 

alloy systems, e.g. FexCo1-x , FexPt1-x Magnetic transition temperatures on the nanoscale

Slide18: 

Conclusions

Slide19: 

Collaborators F. Nolting, Swiss Light Source Paul Scherrer Institut, Switzerland J. Bansmann, Dept of Surface Chemistry and Catalysis Universität Ulm, Germany A. Kleibert, Institut für Physik, Universität Rostock, Germany U. Wiedwald, Dept. Solid State Physics, Universität Ulm, Germany L. J. Heyderman,Laboratory for Micro- and Nanotechnology Paul Scherrer Institut, Switzerland