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A suitable coherent description of the reversible and irreversible magnetic entropy changes in a Tb-based metallic glass with strong random magnetic anisotropy (RMA) is presented. A giant irreversible positive magnetic entropy change is observed from magnetic measurements at low temperatures, which is found to arise from the entropy production, while a small negative one is obtained from heat capacity measurements. The temperature dependences of the irreversible positive magnetic entropy change under a field change of 5 T and the internal entropy production in the initial magnetization process can be described by an exponential law, which is determined by RMA.
Published in:
Applied Physics Letters
(Volume:101
,
Issue:
6
)
Date of Publication: Aug 2012
- Page(s):
- 062411 - 062411-5
- ISSN :
- 0003-6951
- Digital Object Identifier :
- 10.1063/1.4743014
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 09 August 2012
- Issue Date :
- Aug 2012
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