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Mechanism of the giant irreversible positive magnetic entropy change in a Tb-based bulk metallic glass

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5 Author(s)
Luo, Qiang ; School of Materials Science and Engineering, Tongji University, Shanghai 201804, People''s Republic of China ; Schwarz, Bjorn ; Mattern, Norbert ; Shen, Jun
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Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.4743014 

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

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