Magnetocaloric effect in NiMnGa particles produced by spark erosion

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

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 languageEnglish (US)
Article number10M309
JournalJournal of Applied Physics
Volume97
Issue number10
DOIs
StatePublished - May 15 2005

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sparks
erosion
entropy
phase transformations
Curie temperature
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

Magnetocaloric effect in NiMnGa particles produced by spark erosion. / Tang, Y. J.; Solomon, Virgil C.; Smith, David; Harper, H.; Berkowitz, A. E.

In: Journal of Applied Physics, Vol. 97, No. 10, 10M309, 15.05.2005.

Research output: Contribution to journalArticle

Tang, Y. J. ; Solomon, Virgil C. ; Smith, David ; Harper, H. ; Berkowitz, A. E. / Magnetocaloric effect in NiMnGa particles produced by spark erosion. In: Journal of Applied Physics. 2005 ; Vol. 97, No. 10.
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