Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3399773
Keywords
cobalt alloys; ferromagnetic materials; germanium alloys; magnetic transitions; magnetocaloric effects; manganese alloys; refrigerants; solid-state phase transformations
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Funding
- Dutch Technology Foundation (STW)
- Foundation for Fundamental Research on Matter (FOM)
- Netherlands Organisation for Scientific Research (NWO)
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The MnCoGe alloy can crystallize in either the hexagonal Ni(2)In- or the orthorhombic TiNiSi-type of structure. In both phases MnCoGe behaves like a typical ferromagnet with a second-order magnetic phase transition. For MnCoGeB(x) 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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