Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 10: Caloric Effects in Ferromagnetic Materials
MA 10.6: Talk
Monday, March 20, 2017, 16:30–16:45, HSZ 04
Reversible magnetocaloric effect in Ni-Mn based Heusler alloys — •Parul Devi1, Mahdiyeh Ghorbani-Zavareh1,2, Sanjay Singh1, and Claudia Felser1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden Rossendorf, Dresden, Germany
Magnetic refrigeration technology based on the magnetocaloric effect (MCE) has higher refrigeration efficiency and environment friendly, make it an edge over the others. In comparison to other Magnetocaloric materials, Ni-Mn based Heusler alloys are the subject of special interest as they do not involve toxic and rare earth elements. Heusler alloys show higher value of MCE due to the large magnetization change at their first order magneto-structural transition. Although, Heusler alloys show large MCE, the irreversibility of first order phase transition with respect to the magnetic field cycles is a major issue for practical applications. We show here an enhanced reversibility of MCE in a Ni-Mn-Ga and Ni-Mn-In Heusler alloys. The reversible MCE in these alloys is linked with the volume conversion and geometrical compatibility (co-factor) condition of martensite phase transition.