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Reverse magnetostructural transitions by Co and in doping NiMnGa alloys: Structural, magnetic, and magnetoelastic properties

AuthorsAlbertini, Franca; Serrate, David; Algarabel, Pedro A.
Issue Date2011
PublisherTrans Tech Publications
CitationMaterials Science Forum 684: 151-163 (2011)
AbstractWe review the composition dependence of the structural and magnetic properties of the Co-doped Ni-Mn-Ga Ferromagnetic Shape Memory Alloy around the Mn-rich composition Ni50Mn30Ga20. The presence of Co affects 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. The magnetic and structural properties display noticeable discontinuities across the martensitic transformation: remarkable values of the saturation magnetization jump at the transformation (ΔM), of the field dependence of the martensitic transformation temperature (dTM/dH), and of the crystalline volume change (ΔV/V) are reported, and are considerably enhanced by additional In-doping of the quaternary alloy. These properties give rise to a remarkable phenomenology which is of interest for multifunctional applications; magnetic superelasticity and high values of reversible strain are found. © (2011) Trans Tech Publications, Switzerland.
Identifiersdoi: 10.4028/www.scientific.net/MSF.684.151
issn: 0255-5476
Appears in Collections:(ICMA) Artículos
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