2024-03-28T21:37:59Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/539052016-02-17T09:39:37Zcom_10261_31com_10261_3col_10261_284
00925njm 22002777a 4500
dc
Albertini, Franca
author
Serrate, David
author
Algarabel, Pedro A.
author
2011
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 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.
Materials Science Forum 684: 151-163 (2011)
http://hdl.handle.net/10261/53905
10.4028/www.scientific.net/MSF.684.151
Reverse magnetostructural transitions by Co and in doping NiMnGa alloys: Structural, magnetic, and magnetoelastic properties