Journal
NATURE
Volume 435, Issue 7038, Pages 78-81Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature03516
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The frequencies of extended X-ray absorption fine-structure (EXAFS)(1) 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(2-5), 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(6,7). 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(8,9).
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