Giant magnetocaloric effects by tailoring the phase transitions

Trung, N. T.; Zhang, L.; Caron, L.; Buschow, K. H. J.; Brück, E.
April 2010
Applied Physics Letters;4/26/2010, Vol. 96 Issue 17, p172504
Academic Journal
The MnCoGe alloy can crystallize in either the hexagonal Ni2In- or the orthorhombic TiNiSi-type of structure. In both phases MnCoGe behaves like a typical ferromagnet with a second-order magnetic phase transition. For MnCoGeBx with B on interstitial positions, we discover a giant magnetocaloric effect associated with a single first-order magnetostructural phase transition, which can be achieved by tuning the magnetic and structural transitions to coincide. The results obtained on the MnCoGe-type alloys may be extensible to other types of magnetic materials undergoing a first-order structural transformation and can open up some possibilities for searching magnetic refrigerants for room-temperature applications.


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