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 0022-3727

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Abstract

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
ISSN:	0022-3727
Date:	21 June 1998
Volume:	31
Number:	12
Number of Pages:	9
Page Range:	pp. 1478-1486
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/15591

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