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Reverse Magnetostructural Transitions by Co and In Doping NiMnGa Alloys: Structural, Magnetic, and Magnetoelastic Properties (Articolo in rivista)

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Reverse Magnetostructural Transitions by Co and In Doping NiMnGa Alloys: Structural, Magnetic, and Magnetoelastic Properties (Articolo in rivista) (literal)

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Albertini, Franca; Fabbrici, Simone; Paoluzi, Antonio; Kamarad, Jiri; Arnold, Zdenek; Righi, Lara; Solzi, Massimo; Porcari, Giacomo; Pernechele, Chiara; Serrate, David; Algarabel, Pedro (2011)
Reverse Magnetostructural Transitions by Co and In Doping NiMnGa Alloys: Structural, Magnetic, and Magnetoelastic Properties
in Materials science forum; Trans Tech Publications, Zurich (Svizzera)
(literal)

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Albertini, Franca; Fabbrici, Simone; Paoluzi, Antonio; Kamarad, Jiri; Arnold, Zdenek; Righi, Lara; Solzi, Massimo; Porcari, Giacomo; Pernechele, Chiara; Serrate, David; Algarabel, Pedro (literal)

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IMEM CNR Parma; Czech Academy of Sciences; University of Parma; University of Parma; CNISM; University of Zaragoza; ICMA CSIC (literal)

Titolo

Reverse Magnetostructural Transitions by Co and In Doping NiMnGa Alloys: Structural, Magnetic, and Magnetoelastic Properties (literal)

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 Ni(50)Mn(30)Ga(20). 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 (Delta M), of the field dependence of the martensitic transformation temperature (dT(M)/dH), and of the crystalline volume change (Delta V/V) are reported, and are considerably enhanced by additional In-doping of the quaternary alloy. (literal)
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. (literal)

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