Measurement of femtometre-scale atomic displacements by X-ray absorption spectroscopy

The frequencies of extended X-ray absorption fine-structure (EXAFS) measurements, which are oscillations occurring on the high-energy side of an X-ray absorption edge, can be used to identify interatomic distances in materials. We have used a dispersive X-ray spectrometer, which has no moving compon...

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Bibliographic Details
Published in:	Nature Vol. 435; no. 7038; pp. 78 - 81
Main Authors:	Pettifer, Robert F, Mathon, Olivier, Pascarelli, Sakura, Cooke, Michael D, Gibbs, Michael R. J
Format:	Journal Article
Language:	English
Published:	London Nature Publishing 05-05-2005 Nature Publishing Group
Subjects:	Absorption spectroscopy Atoms & subatomic particles Cobalt Condensed matter: structure, mechanical and thermal properties Exact sciences and technology Instruments, apparatus, components and techniques common to several branches of physics and astronomy Measurements common to several branches of physics and astronomy Metrology, measurements and laboratory procedures Physics Scattering Spatial dimensions (e.g.: position, lengths, volume, angles, displacements, including nanometer-scale displacements) Spatial dimensions (eg, position, lengths, volume, angles, displacements, including nanometer-scale displacements) Spectrum analysis Structure of solids and liquids; crystallography Thin films X- and γ-ray instruments and techniques X- and γ-ray spectrometers X-ray absorption spectroscopy: exafs, nexafs, xanes, etc X-ray and γ-ray spectrometers X-ray diffraction and scattering X-rays Fine structure Interatomic distances Displacement measurement Measuring methods X-ray spectroscopy Experimental study EXAFS
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Summary:	The frequencies of extended X-ray absorption fine-structure (EXAFS) measurements, which are oscillations occurring on the high-energy side of an X-ray absorption edge, can be used to identify interatomic distances in materials. We have used a dispersive X-ray spectrometer, which has no moving components, to make rapid measurements with minimal energy drift of the difference in EXAFS from the Fe K edge in an iron-cobalt thin film undergoing periodic strain through magnetostriction. We show that magnetostriction can be detected by differential X-ray absorption. The magnitude of the recorded signal relative to the noise shows a sensitivity to mean differential atomic motion of one femtometre: a factor of 100 times more sensitive than that normally available.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0028-0836 1476-4687
DOI:	10.1038/nature03516