Reconstruction of surface morphology from coherent x-ray reflectivity

Vartanyants, Ivan A.; Pitney, J. A.; Libbert, J. L.; Robinson, Ian

doi:10.1103/physrevb.55.13193

Cited by 55 publications

(27 citation statements)

References 15 publications

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“…3. The time resolution achieved by this approach extends previous coherent X-ray diffraction experiments, as pioneered by, for example, Vartanyants et al (1997) and Robinson et al (1999), which Reconstructed relative phase and beam profile (normalized amplitude) along the sample from simulated data. The starting guess (blue, dotted) was taken to be constant but can also be a random guess.…”

Section: Introductionsupporting

confidence: 50%

Time-resolved coherent X-ray diffraction imaging of surface acoustic waves

et al. 2014

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Time-resolved coherent X-ray diffraction experiments of standing surface acoustic waves, illuminated under grazing incidence by a nanofocused synchrotron beam, are reported. The data have been recorded in stroboscopic mode at controlled and varied phase between the acoustic frequency generator and the synchrotron bunch train. At each time delay (phase angle), the coherent far-field diffraction pattern in the small-angle regime is inverted by an iterative algorithm to yield the local instantaneous surface height profile along the optical axis. The results show that periodic nanoscale dynamics can be imaged at high temporal resolution in the range of 50 ps (pulse length).

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Section: Introductionsupporting

confidence: 50%

Time-resolved coherent X-ray diffraction imaging of surface acoustic waves

et al. 2014

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“…37 We used the surface-sensitive speckle patterns on a crystal truncation rod (CTR). 38,39,40 The CTR x-ray speckles arise from interferences between structure factors of up (+) and down (−) terminations. 41,42,43 A simple derivation 15 yields the CTR structure factor for a fixed l from a mix of + and − domains as, The temporal behavior of the domain boundary motions can be characterized by a single thermodynamic parameter τ, correlation time, using XPCS autocorrelation analysis.…”

Section: Resultsmentioning

confidence: 99%

Partial glass isosymmetry transition in multiferroic hexagonalErMnO3

et al. 2016

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Ferroelectric transitions of a hexagonal multiferroic, ErMnO 3 , are studied by x-ray scattering techniques. An isosymmetry transition, similar to that previously observed for YMnO 3 , approximately 300 K below the well-known ferroic transition temperature is investigated. The partial glassy behavior of the isosymmetry transition is identified by appearance of quasi-elastic scattering lines in high-energy-resolution scans. The glassy behavior is further supported by the increased interlayer decorrelation of (√3×√3)R30º ordering below the isosymmetry transition.The transition behavior is considered for possible hidden sluggish modes and two-step phase transitions theoretically predicted for the stacked triangular antiferromagnets. The in-plane azimuthal (orientational) ordering behaviors were also compared to the theoretical predictions. Coherent x-ray speckle measurements show unambiguously that the domain sizes decrease anomalously near both the isosymmetry and ferroic transitions. However, domain boundary fluctuations increase monotonically with an Arrhenius form with an activation energy of 0.54(5) eV through both transitions.

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“…Due to this arrangement, the footprint of the beam on the sample is highly elongated such that its speckle pattern becomes one dimensional. The reconstruction of the 1D profile of the topography was achieved successfully with the above described algorithm [228] and used to describe the kinetics of silicon oxidation [227]. In the GISAXS geometry, test samples made of arrays of SiGe quantum dots grown on a patterned surface [229] have been inverted successfully; the size of the particles were in the 100 nm range.…”

Section: Direct Data Inversion From Coherent Gisaxs?mentioning

confidence: 99%