| Autor: |
Lewis, L. H., Yu, Ming-hui, Welch, D. O., Gambino, Richard J. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 6/1/2004, Vol. 95 Issue 11, p6912-6914, 3p, 3 Graphs |
| Abstrakt: |
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. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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