Abstract
In Fe0.8 Mn1.5 As compound, an external magnetic field induces a metamagnetic transition from an antiferromagnetic phase to a ferrimagnetic phase above Ts =285 K, leading to large magnetocaloric effects around room temperature. Instead of showing inverse magnetocaloric effects, the sign of the entropy change Δ SM in the compound is unexpectedly negative, revealing a different mechanism. The maximum value of Δ SM is 6.2 Jkg K at 287.5 K for a magnetic field change of 5 T. The study on systems with antiferromagnetism- related metamagnetic transitions may open an important field in searching good materials for room-temperature magnetic refrigeration.
Original language | English |
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Article number | 112503 |
Journal | Applied Physics Letters |
Volume | 91 |
Issue number | 11 |
DOIs | |
State | Published - 2007 |
Funding
This work has been supported by the National Natural Science Foundation of China under Grant No. 50331030.