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Magnetocaloric Properties and Magnetic Anisotropy by Tailoring Phase Transitions in NiMnGa Alloys (Contributo in volume (capitolo o saggio))

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Magnetocaloric Properties and Magnetic Anisotropy by Tailoring Phase Transitions in NiMnGa Alloys (Contributo in volume (capitolo o saggio)) (literal)

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Albertini F.; Solzi M.; Paoluzi A.; Righi L. (2008)
Magnetocaloric Properties and Magnetic Anisotropy by Tailoring Phase Transitions in NiMnGa Alloys
Trans Tech Publications Ltd., Stafa-Zurich (Swaziland) in Advances in Shape Memory Materials: Magnetic Shape Memory Alloys;Code74083, 2008
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Advances in Shape Memory Materials: Magnetic Shape Memory Alloys;Code74083 (literal)

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In: Advances in Shape Memory Materials. vol. 583 pp. 169 - 196. Chernenko V.A (ed.). (Materials Science Forum). Switzerland: Trans Tech Publication TTP, 2008. (literal)

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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. (literal)

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CNR-IMEM, Parma, Dipartimento di Fisica dell'Università di Parma and CNISM, Dipartimento di Chimica GIAF dell'Università di Parma (literal)

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Magnetocaloric Properties and Magnetic Anisotropy by Tailoring Phase Transitions in NiMnGa Alloys (literal)

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Abstract

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. © 2008 Trans Tech Publications. (literal)

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