We 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 Indoping 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.

Reverse magnetostructural transitions by Co and In doping NiMnGa alloys: structural, magnetic and magnetoelastic properties / F., Albertini; S., Fabbrici; A., Paoluzi; J., Kamarad; Z., Arnold; Righi, Lara; Solzi, Massimo; Porcari, Giacomo; Pernechele, Chiara; D., Serrate; P., Algarabel. - STAMPA. - 684(2011), pp. 149-161. [10.4028/www.scientific.net/MSF.684.151]

Reverse magnetostructural transitions by Co and In doping NiMnGa alloys: structural, magnetic and magnetoelastic properties

RIGHI, Lara;SOLZI, Massimo;PORCARI, Giacomo;PERNECHELE, Chiara;
2011

Abstract

We 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 Indoping 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.
978-3-03785-147-0
Reverse magnetostructural transitions by Co and In doping NiMnGa alloys: structural, magnetic and magnetoelastic properties / F., Albertini; S., Fabbrici; A., Paoluzi; J., Kamarad; Z., Arnold; Righi, Lara; Solzi, Massimo; Porcari, Giacomo; Pernechele, Chiara; D., Serrate; P., Algarabel. - STAMPA. - 684(2011), pp. 149-161. [10.4028/www.scientific.net/MSF.684.151]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2350750
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