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Manipulation of the metamagnetic transition and entropy change in Gd5(Si,Ge)4

Authors :
Ming-hui Yu
David O. Welch
Laura H. Lewis
Richard J. Gambino
Source :
Journal of Applied Physics. 95:6912-6914
Publication Year :
2004
Publisher :
AIP Publishing, 2004.

Abstract

100 nm coatings of Fe and of Al were found to alter the magnetic attributes, such as the initial susceptibility and metamagnetic transition field, of the giant magnetocaloric material Gd5(Ge,Si)4 and thereby increase the entropy change for a given applied magnetic field, relative to uncoated samples. The experimental data strongly suggest that these coatings confer a strain that propagates through the material and enhances the effect of the magnetic field in the metamagnetic phase transition range. A simplified Landau theory of coupled magnetic and structural transitions was developed for Gd5(Si1−xGex)4 and used to analyze the thermodynamics and phase transitions of this material under the influence of magnetic fields and elastic strain fields.

Details

ISSN :
10897550 and 00218979
Volume :
95
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........d10167576360271ea9cdbd3f49acade0
Full Text :
https://doi.org/10.1063/1.1688572