Magnetic transitions and magnetocaloric effects in Fe0.75Mn1.35As
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In Fe0.75Mn1.35As compound, a metamagnetic transition from an antiferromagnetic phase to a ferrimagnetic phase can be induced above its phase transition temperature Ts = 165 K by an external magnetic field, which leads to large magnetocaloric effects around Ts. The sign of the magnetic entropy change ΔSM in the Fe0.75Mn1.35As compound is negative, not as expected as an inverse magnetocaloric effect, and the maximum value of ΔSM is 4.2 J/kg K at 167.5 K for a magnetic field change of 5 T. Although it induces an irreversible lattice expansion, the cycling of a magnetic field does not induce an irreversible change in the magnetic transitions and magnetocaloric behaviors. The antiferromagnetism-related metamagnetic transitions with a large magnetic entropy change may provide with an opportunity in searching novel materials for magnetic refrigeration.
KeywordsMagnetic Transition Magnetocaloric Effect Magnetic Entropy Change Magnetic Refrigeration Magnetic Field Change
This work has been supported by the National Natural Science Foundation of China under Grant No. 50331030.