PUMA
Istituto dei materiali per l'elettronica ed il magnetismo     
Albertini F., Solzi M., Paoluzi A., Righi L. Magnetocaloric Properties and Magnetic Anisotropy by Tailoring Phase Transitions in NiMnGa Alloys. vol. 583 Chernenko V.A (ed.). (Materials Science Forum). Switzerland: Trans Tech Publication TTP, 2008.
 
 
Abstract
(English)
The giant magnetocaloric properties of NiMnGa alloys can be enhanced by suitable composition changes that make structural and magnetic transition temperatures to coincide. In this paper we report results on critical temperatures, magnetic anisotropy, and magnetocaloric effect in Ni- and Mn-rich alloys as a function of composition. A phenomenological phase diagram, useful for the identification by thermomagnetic analysis of magnetic and structural transitions in the vicinity of their coincidence, is proposed. Particular emphasis is given to the discussion of giant magnetocaloric effect of those alloys showing a first order magnetostructural transition, the method of its determination, and the potentialities for applications in the field of magnetic refrigeration.
URL: http://www.scientific.net/0-87849-381-6/
DOI: 10.4028/0-87849-381-6.169
Subject Heusler alloys, NiMnGa, ferromagnetic shape memory materials, martensitic transformation,
magnetocrystalline anisotropy, giant magnetocaloric effect, magnetic refrigeration


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