Martensitic transition and inverse magnetocaloric effect in Co doping Ni–Mn–Sn Heulser alloy

• Published in: The European physical journal. B, Condensed matter physics Vol. 67; no. 2; pp. 193 - 196
• Main Authors: Jing, C., Li, Z., Zhang, H. L., Chen, J. P., Qiao, Y. F., Cao, S. X., Zhang, J. C.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 2009; EDP Sciences
• Subjects: Complex Systems; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fluid- and Aerodynamics; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetocaloric effect, magnetic cooling; Martensitic transformations; Materials science; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Physics and Astronomy; Solid State and Materials; Solid State Physics; 75.50.Cc Other ferromagnetic metals and alloys; 75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects; 81.30.kf Martensitic transformations; 75.30.Sg Magnetocaloric effect, magnetic cooling; Tin alloys; Nickel alloys; Inverse problems; Magnetization; Magnetocaloric effects; Doping; Manganese alloys; Martensitic transformations; Magnetic field effects; Cobalt additions; Exchange interactions; Transition element alloys
• ISSN: 1434-6028; 1434-6036
• DOI: 10.1140/epjb/e2009-00023-9

We presented the martensitic transition and magnetocaloric effect of the substituted Heulser alloy Ni
50-x
Co
x
Mn
38
Sn
12
(x = 2, 4, and 6). A large magnetic entropy change of 37.1 J/kg K above room temperature for a magnetic field change of 50 kOe is obtained in Ni
48
Co
2
Mn
38
Sn
12
alloy. With the increase of Co concentration, the martensitic transition shifts to lower temperature and the magnetic entropy change decreases. This behavior could be ascribed by the fact that the FM exchange coupling is enhanced much more with increasing Co content.