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Soft x-ray coherent scattering: Instrument and methods at ESRF ID08
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Image of FIG. 1.
FIG. 1.

(Color online) Layout of the experimental setup (not to scale).

Image of FIG. 2.
FIG. 2.

Electron microscopy images (top row) and small angle scattering patterns on logarithmic gray scale (bottom row) for the pinhole (left column) and the pinhole (right column) used in our experiments. The diameters measured in the microscope are 9.6 and , respectively.

Image of FIG. 3.
FIG. 3.

(Color online) Sketch of the experiment on the magnetic line grating (not to scale). A atomic force microscopy image of part of the sample is shown.

Image of FIG. 4.
FIG. 4.

(Color online) Soft x-ray resonant magnetic scattering (SXRMS) image from the magnetic nanograting. The axes give the pixel numbers of the region of interest of the CCD . One pixel corresponds to in exit angle. The specular peak is the second peak .

Image of FIG. 5.
FIG. 5.

(Color online) Diffraction fringes around the specular reflection (horizontal pixels 200–700 from Fig. 4, full vertical range). Top: on a logarithmic color scale (photons). Middle: on a linear arbitrary color scale. Bottom: on a linear arbitrary color scale.

Image of FIG. 6.
FIG. 6.

(Color online) Top: The photon intensity collected in the pixels as a function of the radial distance , for and (intensities are integrated over an angular range of 5°). Bottom: The high frequency variation of the radial intensity , obtained by normalizing over the fringe periodicity: . is plotted.

Image of FIG. 7.
FIG. 7.

(Color online) Azimuthal plot of the standard deviation of calculated on a range covering more than ten fringes, for each superlattice peak (including the specular peak). Peaks are numbered from left to right, according to Fig. 4.

Image of FIG. 8.
FIG. 8.

(Color online) Low intensity area in linear color scale (photons).

Image of FIG. 9.
FIG. 9.

(Color online) Two slices in the bidimensional autocorrelation function of the low intensity area. The thin horizontal lines show the limits between incoherent processes (lower part), coherent scattering (middle part), and noise (single data point in upper part). The coherence here is .

Image of FIG. 10.
FIG. 10.

(Color online) Detail of the magnetic speckles between specular reflection and left superlattice peak. The pixel numbers correspond to the axes of Fig. 4. The magnetic speckles are recorded with good oversampling, high statistics, and high contrast: the intensity drops from 917 to 11 photons between the two main speckles.


Generic image for table
Table I.

Geometric parameters of the experimental setup.

Generic image for table
Table II.

Rms values of the beam characteristics in the undulators (Source: ESRF Highlights 2004). The first harmonic of the undulator is . Calculations are performed assuming Gaussian beams.

Generic image for table
Table III.

Ranges and resolutions of the diffractometer motors.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Soft x-ray coherent scattering: Instrument and methods at ESRF ID08