Effect of Partial Substitution of Ni by Co on the Magnetic and Magnetocaloric Properties of Ni₅₀Mn₃₅In₁₅ Heusler Alloy

Authors

Arjun K. Pathak, Southern Illinois University Carbondale
Igor Dubenko, Southern Illinois University Carbondale
Yimin Xiong, Louisiana State University
Philip W. Adams, Louisiana State University
Shane Stadler, Louisiana State University
Naushad Ali, Southern Illinois University Carbondale

Comments

© 2011 American Institute of Physics

Published in Journal of Applied Physics, Vol. 109 No. 7 (2011) at 10.1063/1.3540696

Abstract

The magnetic and magnetocaloric properties of Ni₄₈Co₂Mn₃₅In₁₅ were studied using magnetization and heat capacity measurements. The magnetic entropy change (Delta S_M) was evaluated from both magnetizing and demagnetizing fields. An inverse Delta S_M for the magnetizing and demagnetizing processes were found to be 20.5 and 18.5 J kg^-1 K^-1, respectively, for Delta H = 5 T at the martensitic transition (T=T_M). The normal Delta S_M was found to be -5.4 J kg^-1 K^-1 for both fields at the paramagnetic/ferromagnetic transition (T=T_C). The effective refrigeration capacity at T_M and T_C for magnetizing field was found to be 268 and 243 J/kg (285 and 243 J/kg for the demagnetizing field), respectively. We have also estimated the density of states, the Debye temperature, and the inverse adiabatic temperature change to be 4.93 states/eV f.u., 314 K, and -3.7 K, respectively, from the measured heat capacity data.

Recommended Citation

Pathak, Arjun K., Dubenko, Igor, Xiong, Yimin, Adams, Philip W., Stadler, Shane and Ali, Naushad. "Effect of Partial Substitution of Ni by Co on the Magnetic and Magnetocaloric Properties of Ni₅₀Mn₃₅In₁₅ Heusler Alloy." (Apr 2011).