Giant magnetocaloric effects by tailoring the phase transitions

Journal article (2010)
Department
Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2010 American Institute of Physics
DOI: https://doi.org/doi:10.1063/1.3399773
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Published Date

27-04-2010

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Source:

Appl. Phys. Lett. 96, 172504 (2010)

Faculty

Applied Sciences

Department

Fundamental Aspects of Materials and Energy

Abstract

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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