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From direct to inverse giant magnetocaloric effect in Co-doped NiMnGa multifunctional alloys

SYSNO ASEP	0358968
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	From direct to inverse giant magnetocaloric effect in Co-doped NiMnGa multifunctional alloys
Author(s)	Fabbrici, S. (IT) Kamarád, Jiří (FZU-D)_{RID, ORCID} Arnold, Zdeněk (FZU-D)_{RID, SAI, ORCID} Casoli, F. (IT) Paoluzi, A. (IT) Bolzoni, F. (IT) Cabassi, R. (IT) Solzi, C. (IT) Porcari, G. (IT) Pernechele, C. (IT) Albertini, F. (IT)
Source Title	Acta Materialia. - : Elsevier - ISSN 1359-6454 Roč. 59, č. 1 (2011), s. 412-419
Number of pages	8 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	Ni–Mn–Ga–Co ; ferromagnetic shape memory alloys ; magnetostructural transformations ; magnetic properties ; inverse magnetocaloric effect
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	GA202/09/0030 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z10100521 - FZU-D (2005-2011)
UT WOS	000284789200042
DOI	10.1016/j.actamat.2010.09.059
Annotation	We report the magnetic and magnetocaloric properties in Co-doped Ni-Mn-Ga Heusler alloys around the Mn-rich composition Ni50Mn30Ga20. The presence of Co affects profoundly the critical temperatures and alters the exchange interactions of martensite and austenite to different extents by varying the composition it is possible to tune the critical temperatures and to induce a paramagnetic gap between the magnetically ordered martensite and magnetic austenite,thus giving rise to a reverse magnetostructural transformation.Contrary to the Co-free alloys,the saturation magnetization moment of austenite is strongly enhanced by Co with respect to the martensitic one:thus the magnetocaloric effect turns from direct into inverse.Remarkable values of the magnetic properties related to the magnetocaloric effect,e.g. the saturation magnetization jump at the transformation(DM) and the field dependence of the transformation temperature(dT/dH)are reported.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2012

Number of the records: 1