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Magnetocaloric Improvements in Doped Heusler Alloys

Published online by Cambridge University Press:  18 May 2017

Michael V. McLeod ,
Bhaskar S. Majumdar  and
Zafer Turgut
Michael V. McLeod
Affiliation:
Materials Department, New Mexico Institute of Mining and Technology, Socorro, NM87801
Bhaskar S. Majumdar*
Affiliation:
Materials Department, New Mexico Institute of Mining and Technology, Socorro, NM87801
Zafer Turgut
Affiliation:
Air Force Research Laboratory, Wright-Patterson AFB, OH45433USA
*
*(Email: [email protected])
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Abstract

Magnetocaloric materials have gained significant interest as an environment friendly and efficient refrigeration technology. We have been working on Heusler alloys, primarily the Ni-Mn-Ga system for improved magnetocaloric effect (MCE). We have observed significant MCE increase in stress assisted thermally cycled samples and demonstrated that one primary mechanism is texture change. More recently, we have observed volumetric decrease as well as anisotropy changes due to stressed cycling. The influence of these parameters on magnetic anisotropy and MCE are discussed. We have also utilized isoelectronic Al substitution at the Ga lattice sites for optimizing atomic distances and exchange interactions in an effort to bring about magnetostructural transformation closer to room temperature (RT) while retaining high MCE. The results show that Al substitutions can bring about large decreases (50 – 70K) in both the Curie (TC) and martensite start (Ms) temperatures, and permit fine tuning the magnetostructural transformation temperature.

Keywords

magnetic propertiesalloydopant
Type
Articles
Information
MRS Advances , Volume 2 , Issue 56: Energy Storage and Conversion , 2017 , pp. 3453 - 3458
Copyright
Copyright © Materials Research Society 2017 

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References

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