Modeling of the Magnetization and Magnetocaloric Effect in Ni2MnGa Heusler Alloy with the Effective Field Theory

This study modeled and investigated the magnetocaloric effect in Ni 2 MnGa Heusler alloy characterized by its magnetic entropy change (ΔS m ) and its refrigerant capacity (RC FWHM ) by using the effective field theory. It was found that the peak of the negative magnetic entropy change (ΔS m pk ) and...

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Bibliographic Details
Published in:Journal of low temperature physics 2022, Vol.207 (3-4), p.171-180
Main Authors: Yildiz, Yasin Göktürk, Yildiz, Gökçen Dikici
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Entropy
Field theory
Heusler alloys
Low temperature physics
Magnetic fields
Magnetic Materials
Magnetic properties
Magnetism
Physics
Physics and Astronomy
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Summary:This study modeled and investigated the magnetocaloric effect in Ni 2 MnGa Heusler alloy characterized by its magnetic entropy change (ΔS m ) and its refrigerant capacity (RC FWHM ) by using the effective field theory. It was found that the peak of the negative magnetic entropy change (ΔS m pk ) and the RC FWHM decreased as the external magnetic field increased, whereas the full width half maximum peak ( δ T FWHM ) and the temperature (T pk ) of the ΔS m pk both increased. At higher external magnetic fields, δ T FWHM and T pk were close to each other, but the ΔS m pk and RC FWHM were separated from each other. The RC FWHM of the corner atoms (Ni1 and Ni3) was higher than those of the central atom (Ni5). This result revealed that corner atoms have an important role in the magnetocaloric properties of Ni 2 MnGa and other materials with a magnetocaloric effect.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-022-02706-y