A study of the x-ray focusing effect of a magnetoacoustically excited FeBO3 crystal using synchrotron radiation diffraction imaging
UNSPECIFIED. (1998) A study of the x-ray focusing effect of a magnetoacoustically excited FeBO3 crystal using synchrotron radiation diffraction imaging. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 31 (12). pp. 1478-1486. ISSN 0022-3727Full text not available from this repository.
Ultrasonic standing waves, excited in an FeBO3(111) crystal through magnetoelastic coupling, are visualized using synchrotron radiation diffraction imaging ('topography'). This observation relies on the possibility at the ESRF of recording images with long sample-to-film propagation distances (up to 1.5 m) without substantial loss of resolution. The crystal acts as an x-ray focusing lens periodically in time, an effect that strongly depends both on the amplitude of the magnetic field excitation and on the propagation distance. The standing-wave-related contrast is hardly visible close to the sample, very sharp for a focusing distance (typically similar or equal to 0.4 m) whereas beyond this position the intensity maxima broaden due to the defocusing effect. We propose a model which accounts for the presented results, allows the understanding of the details of the resonance patterns and gives access to the main characteristics of the vibration: amplitude, shape, polarization, wavelength and sound velocity. This effect could be used to simultaneously monochromatize and focus the x-ray beam.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||JOURNAL OF PHYSICS D-APPLIED PHYSICS|
|Publisher:||IOP PUBLISHING LTD|
|Official Date:||21 June 1998|
|Number of Pages:||9|
|Page Range:||pp. 1478-1486|
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