Microstructure, magnetic properties and magnetocaloric effect in melt-spun Ni–Mn–Ga ribbons

Structural transformation, microstructure and magnetocaloric effect (MCE) were investigated in melt-spun Ni 55Mn 20.6Ga 24.4 and Ni 55Mn 19.6Ga 25.4 ribbons. Magnetic and thermal studies of the ribbons revealed the occurrence of simultaneous structural and magnetic transitions near room temperature...

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Published in:Journal of alloys and compounds 2009-06, Vol.478 (1), p.59-62
Main Authors: Rao, N.V. Rama, Gopalan, R., Chandrasekaran, V., Suresh, K.G.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnetic measurements
Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetocaloric
Magnetocaloric effect, magnetic cooling
Martensitic transformations
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Rapid solidification
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container_title Journal of alloys and compounds
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creator Rao, N.V. Rama
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description Structural transformation, microstructure and magnetocaloric effect (MCE) were investigated in melt-spun Ni 55Mn 20.6Ga 24.4 and Ni 55Mn 19.6Ga 25.4 ribbons. Magnetic and thermal studies of the ribbons revealed the occurrence of simultaneous structural and magnetic transitions near room temperature with a narrow thermal hysteresis of magnetization ≈2 K. Maximum entropy changes (Δ S M) of −9.5 and −10.4 J/kg K have been obtained at 309 K for a field change of 2 T in Ni 55Mn 20.6Ga 24.4 and Ni 55Mn 19.6Ga 25.4 ribbons, respectively. The Ni 55Mn 19.6Ga 25.4 ribbon exhibits refrigeration capacity (RC) of 47 J/kg with low average hysteresis loss (≈1.5 J/kg) at the merged structural and magnetic transition temperature.
doi_str_mv 10.1016/j.jallcom.2008.12.015
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subjects Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnetic measurements
Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetocaloric
Magnetocaloric effect, magnetic cooling
Martensitic transformations
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Rapid solidification
title Microstructure, magnetic properties and magnetocaloric effect in melt-spun Ni–Mn–Ga ribbons
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