Effect of pressure on magnetoelastic coupling in 3d metal alloys studied with x-ray absorption spectroscopy

Using x-ray absorption spectroscopy, we have studied the effect of pressure on femtometer-scale bond strain due to anisotropic magnetostriction in a thin FeCo film. At 7 GPa local magnetostrictive strain is found to be larger than at ambient, in agreement with spin-polarized ab initio electronic str...

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Bibliographic Details
Published in:Physical review letters 2007-12, Vol.99 (23), p.237204-237204
Main Authors: Pascarelli, S, Ruffoni, M P, Trapananti, A, Mathon, O, Aquilanti, G, Ostanin, S, Staunton, J B, Pettifer, R F
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
ANISOTROPY
BINARY ALLOY SYSTEMS
COBALT ALLOYS
COMPRESSION
ELECTRONIC STRUCTURE
FLEXIBILITY
IRON ALLOYS
MAGNETOSTRICTION
MATERIALS SCIENCE
PRESSURE RANGE GIGA PA
SPIN ORIENTATION
STRAINS
X-RAY SPECTROSCOPY
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Summary:Using x-ray absorption spectroscopy, we have studied the effect of pressure on femtometer-scale bond strain due to anisotropic magnetostriction in a thin FeCo film. At 7 GPa local magnetostrictive strain is found to be larger than at ambient, in agreement with spin-polarized ab initio electronic structure calculations, but contrary to the expected effect of compression on bond stiffness. The availability of high pressure data on local magnetostrictive strain opens new capabilities for validating theoretical predictions and can lead to the development of materials with the desired properties.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.99.237204