Large Magnetocaloric Effects over a Wide Temperature Range in MnCo_1-xZn_xGe

Authors

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

Comments

© 2013 American Institute of Physics

Published in Journal of Applied Physics Vol. 113 No. 17A922 (2013) at doi: 10.1063/1.4798339

Abstract

The magnetic and structural transitions can be controlled to coincide by partial substitution of Zn for Co in MnCo_1-xZn_xGe, leading to a large magnetocaloric effects over a wide temperature range. The magnetostructural transition from paramagnetic to ferromagnetic state results in magnetic entropy changes (Delta S_M) of 26 J/kg K at 327K for Delta H = 5 T in the case of x = 0.045. Interestingly, a structurally driven first-order phase transition between two high magnetization states as observed for x = 0.05 and 0.06 also lead to large values of -Delta S_M = 31.4 and 20.6 J/kg K for Delta H = 5 T at 281 and 209 K, respectively. The observed large magnetocaloric effects with tunable phase transition temperatures make these materials promising for near room-temperature magnetic cooling applications.

Recommended Citation

Samanta, Tampas, Dubenko, Igor, Quetz, Abdiel, Stadler, Shane and Ali, Naushad. "Large Magnetocaloric Effects over a Wide Temperature Range in MnCo_1-xZn_xGe." (May 2013).