Magnetocaloric effect in NiMnGa particles produced by spark erosion

Y. J. Tang; Virgil C. Solomon; David Smith; H. Harper; A. E. Berkowitz

doi:10.1063/1.1852451

Magnetocaloric effect in NiMnGa particles produced by spark erosion

Y. J. Tang, Virgil C. Solomon, David Smith, H. Harper, A. E. Berkowitz

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Abstract

The magnetic entropy change of tetragonal and orthorhombic NiMnGa fine particles made by spark erosion was investigated in this paper. It was found that the structure and crystalline phase transformation temperatures can be strongly affected by the compositions of the particles, while Curie temperature is less sensitive to the compositions. Due to the possible distribution of the particle size and compositions in these particles, the magnetic entropy changes observed are much broader and smaller than those of bulk NiMnGa alloys. The maximum absolute value of entropy change ΔS=2 J Kg-1 K-1 was observed for tetragonal structure NiMnGa particles at 95 °C in a field of 2 T.

Original language	English (US)
Article number	10M309
Journal	Journal of Applied Physics
Volume	97
Issue number	10
DOIs	https://doi.org/10.1063/1.1852451
State	Published - May 15 2005

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General Physics and Astronomy

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abstract = "The magnetic entropy change of tetragonal and orthorhombic NiMnGa fine particles made by spark erosion was investigated in this paper. It was found that the structure and crystalline phase transformation temperatures can be strongly affected by the compositions of the particles, while Curie temperature is less sensitive to the compositions. Due to the possible distribution of the particle size and compositions in these particles, the magnetic entropy changes observed are much broader and smaller than those of bulk NiMnGa alloys. The maximum absolute value of entropy change ΔS=2 J Kg-1 K-1 was observed for tetragonal structure NiMnGa particles at 95 °C in a field of 2 T.",

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AU - Tang, Y. J.

AU - Solomon, Virgil C.

AU - Smith, David

AU - Harper, H.

AU - Berkowitz, A. E.

PY - 2005/5/15

Y1 - 2005/5/15

N2 - The magnetic entropy change of tetragonal and orthorhombic NiMnGa fine particles made by spark erosion was investigated in this paper. It was found that the structure and crystalline phase transformation temperatures can be strongly affected by the compositions of the particles, while Curie temperature is less sensitive to the compositions. Due to the possible distribution of the particle size and compositions in these particles, the magnetic entropy changes observed are much broader and smaller than those of bulk NiMnGa alloys. The maximum absolute value of entropy change ΔS=2 J Kg-1 K-1 was observed for tetragonal structure NiMnGa particles at 95 °C in a field of 2 T.

AB - The magnetic entropy change of tetragonal and orthorhombic NiMnGa fine particles made by spark erosion was investigated in this paper. It was found that the structure and crystalline phase transformation temperatures can be strongly affected by the compositions of the particles, while Curie temperature is less sensitive to the compositions. Due to the possible distribution of the particle size and compositions in these particles, the magnetic entropy changes observed are much broader and smaller than those of bulk NiMnGa alloys. The maximum absolute value of entropy change ΔS=2 J Kg-1 K-1 was observed for tetragonal structure NiMnGa particles at 95 °C in a field of 2 T.

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Magnetocaloric effect in NiMnGa particles produced by spark erosion

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