Controlling magnetostructural transition and magnetocaloric effect in multi-component transition-metal-based materials

Proper coupling between structural and magnetic transitions is critical for the emergence and control of magnetocaloric effects in solids. We examine the influence of minor substitutional doping (replacing Mn by Cr and Al by Sn) and interstitial doping with B on the magnetic, structural, and magneto...

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Bibliographic Details
Published in:Journal of applied physics 2021-05, Vol.129 (19)
Main Authors: Biswas, Anis, Zarkevich, N. A., Mudryk, Y., Pathak, Arjun K., Smirnov, A. V., Balema, V. P., Johnson, Duane D., Pecharsky, V. K.
Format: Article
Language:English
Subjects:
Calorimetry
Crystal structure
Crystallography
Density functional theory
Magnetism
MATERIALS SCIENCE
Phase transitions
X-ray diffraction
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Summary:Proper coupling between structural and magnetic transitions is critical for the emergence and control of magnetocaloric effects in solids. We examine the influence of minor substitutional doping (replacing Mn by Cr and Al by Sn) and interstitial doping with B on the magnetic, structural, and magnetocaloric properties of recently discovered Mn0.5Fe0.5NiSi0.94Al0.06 alloy exhibiting a giant magnetocaloric effect near room temperature. We demonstrate that magnetocaloric properties of the base compound can be controlled and, in some cases, improved by chemical substitutions. First-principles computations elucidate how small changes in the composition affect properties in this family of compounds and, thus, provide useful guidance for the selection of suitable doping elements for such materials. Here the magnetic-field-induced entropy change measured for Mn0.5Fe0.5NiSi0.94Al0.06B0.005 is –22 J/kg K near room temperature for the applied magnetic field of 2 T, and it is among the highest known values for this class of materials.
ISSN:0021-8979
1089-7550