Magnetostructural Phase Transitions and Magnetocaloric Effects in MnNiGe1-xAlx

Authors

Tampas Samanta, Southern Illinois University Carbondale
Igor Dubenko, Southern Illinois University Carbondale
Abdiel Quetz, Southern Illinois University Carbondale
Samuel Temple, Southern Illinois University Carbondale
Shane Stadler, Louisiana State University
Naushad Ali, Southern Illinois University Carbondale

Comments

© 2012 American Institute of Physics

Published in Applied Physics Letters, Vol. 100 No. 5 (2012) at doi: 10.1063/1.3681798

Abstract

The thermomagnetic and magnetocaloric properties of the MnNiGe_1−xAl_x system have been investigated by magnetization and differential scanning calorimetry (DSC) measurements. The presence of first-order magnetostructural transitions (MSTs) from hexagonal ferromagnetic to orthorhombic antiferromagnetic phases has been detected for x = 0.085 and 0.09 at 193 K and 186 K, respectively. The values of latent heat (L = 6.6 J/g) and corresponding total entropy changes (ΔS_T = 35 J/kg K) have been evaluated for the MST (x = 0.09) from DSC measurements. The magnetic entropy change for x = 0.09 (ΔS_M = 17.6 J/kg K for 5 T) was found to be comparable with well-known giant magnetocaloric materials, such as Gd₅Si₂Ge₂, MnFeP_0.45As_0.55, and Ni₅₀Mn₃₇Sn₁₃.

Recommended Citation

Samanta, Tampas, Dubenko, Igor, Quetz, Abdiel, Temple, Samuel, Stadler, Shane and Ali, Naushad. "Magnetostructural Phase Transitions and Magnetocaloric Effects in MnNiGe1-xAlx." (Feb 2012).