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Soft X-Ray Magneto-Optics: Probing Magnetism by Resonant Scattering Experiments

C. Spezzani H. Popescu 1 F. Fortuna 2 R. Delaunay 3 R. Breitwieser 3, 4 N. Jaouen 1 M. Tortarolo 1 Mahmoud Eddrief 4 F. Vidal 4 Victor H. Etgens 4 Massimiliano Marangolo 4 Maurizio Sacchi 1, 4 
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : The most advanced X-ray sources (third generation synchrotrons, linear free-electron lasers and high-harmonic generation sources) widen the range of application of X-ray scattering techniques considerably. Beyond flux and brilliance, improvements in polarization tuneability, degree of coherence and selectable time-structure promoted new methods for investigating the electronic and magnetic properties of solids. The soft X-ray range (50-2000 eV) is well suited for studying magneto-optical effects in laterally confined submicron sized objects, either artificially built or self-assembled. First, by tuning the photon energy at a core resonance, one provides the X-ray scattering technique with element selectivity. Second, resonant excitations make the optical constants sensitive to the local magnetization by introducing large off-diagonal elements in the dielectric tensor; since magnetic effects are stronger when the core excitation produces a dipolar transition to final states involving the magnetic orbitals (3d for the first row TM; 4f for RE), the most interesting resonances for X-ray magneto-optics [(2, 3)p -> 3d and (3, 4)d -> 4f] are all located in the soft X-ray region. Finally, the wavelengths corresponding to soft X-rays are very well suited for scattering studies of nanometer- to micrometer-sized magnetic structures. We will present the results of recent soft X-ray resonant scattering experiments, showing that the combination of element selectivity, magnetic sensitivity and structural analysis can help disentangling and understanding the magnetic properties of complex self-assembled periodic systems. Lastly, recent applications of coherent scattering to the X-ray holographic imaging of magnetic domains will be presented.
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Submitted on : Monday, December 2, 2013 - 2:51:07 PM
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C. Spezzani, H. Popescu, F. Fortuna, R. Delaunay, R. Breitwieser, et al.. Soft X-Ray Magneto-Optics: Probing Magnetism by Resonant Scattering Experiments. 10th Latin American Workshop on Magnetism, Magnetic Materials and their Applications (LAW3M), Apr 2013, Buenos Aires, Argentina. pp.4711-4716, ⟨10.1109/TMAG.2013.2256113⟩. ⟨in2p3-00912674⟩



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