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Sökning: WFRF:(Schlage K.)

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1.
  • Herlitschke, M., et al. (författare)
  • Spin disorder in maghemite nanoparticles investigated using polarized neutrons and nuclear resonant scattering
  • 2016
  • Ingår i: International Conference On Polarised Neutrons For Condensed Matter Investigations (PNCMI 2014).
  • Konferensbidrag (refereegranskat)abstract
    • The manuscript reports the investigation of spin disorder in maghemite nanoparticles of different shape by a combination of polarized small -angle neutron scattering (SANSPOL) and nuclear forward scattering (NFS) techniques. Both methods are sensitive to magnetization on the nanoscale. SANSPOL allows for investigation of the particle morphology and spatial magnetization distribution and NFS extends this nanoscale information to the atomic scale, namely the orientation of the hyperfine field experienced by the iron nuclei. The studied nanospheres and nanocubes with diameters of 7.4nm and 10.6 nm, respectively, exhibit a significant spin disorder. This effect leads to a reduction of the magnetization to 44 % and 58% of the theoretical maghemite bulk value, observed consistently by both techniques.
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2.
  • Singer, A., et al. (författare)
  • Intensity Interferometry of Single X-Ray Pulses from a Synchrotron Storage Ring
  • 2014
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 113:6, s. Art. no. 064801-
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on measurements of second-order intensity correlations at the high-brilliance storage ring PETRA III using a prototype of the newly developed adaptive gain integrating pixel detector. The detector records individual synchrotron radiation pulses with an x-ray photon energy of 14.4 keV and repetition rate of about 5 MHz. The second-order intensity correlation function is measured simultaneously at different spatial separations, which allows us to determine the transverse coherence length at these x-ray energies. The measured values are in a good agreement with theoretical simulations based on the Gaussian Schell model.
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