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Search: WFRF:(KEVAN SD)

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1.
  • Assefa, T. A., et al. (author)
  • The fluctuation–dissipation measurement instrument at the Linac Coherent Light Source
  • 2022
  • In: Review of Scientific Instruments. - : AIP Publishing. - 1089-7623 .- 0034-6748. ; 93
  • Journal article (peer-reviewed)abstract
    • The development of new modes at x-ray free electron lasers has inspired novel methods for studying fluctuations at different energies and timescales. For closely spaced x-ray pulses that can be varied on ultrafast time scales, we have constructed a pair of advanced instruments to conduct studies targeting quantum materials. We first describe a prototype instrument built to test the proof-of-principle of resonant magnetic scattering using ultrafast pulse pairs. This is followed by a description of a new endstation, the so-called fluctuation–dissipation measurement instrument, which was used to carry out studies with a fast area detector. In addition, we describe various types of diagnostics for single-shot contrast measurements, which can be used to normalize data on a pulse-by-pulse basis and calibrate pulse amplitude ratios, both of which are important for the study of fluctuations in materials. Furthermore, we present some new results using the instrument that demonstrates access to higher momentum resolution.
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3.
  • Pierce, MS, et al. (author)
  • Disorder-induced microscopic magnetic memory
  • 2005
  • In: Physical Review Letters. - 1079-7114. ; 94:1
  • Journal article (peer-reviewed)abstract
    • Using coherent x-ray speckle metrology, we have measured the influence of disorder on major loop return point memory (RPM) and complementary point memory (CPM) for a series of perpendicular anisotropy Co/Pt multilayer films. In the low disorder limit, the domain structures show no memory with field cycling-no RPM and no CPM. With increasing disorder, we observe the onset and the saturation of both the RPM and the CPM. These results provide the first direct ensemble-sensitive experimental study of the effects of varying disorder on microscopic magnetic memory and are compared against the predictions of existing theories.
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