Giant magnetocaloric effects near room temperature in Mn 1-xCuxCoGe

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Magnetic and structural transitions were found to coincide by substituting Cu for Mn in Mn1-xCuxCoGe, leading to a giant magnetocaloric effects associated with the first-order magnetostructural phase transition from the ferromagnetic to paramagnetic state. Maximum magnetic entropy changes of -ΔSM=52.5 and 53.3 J/kg K for a magnetic field change of ΔH=5T have been observed at 302 and 316K, for x=0.080 and 0.085, respectively. The giant magnetocaloric effects with tunable phase transition temperatures through subtle variations in composition make this system promising for room-temperature magnetic cooling applications. © 2012 American Institute of Physics.

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Applied Physics Letters

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