Magnetic transitions and magnetocaloric effects in Fe0.75Mn1.35As |
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Authors: | N K Sun D Li and Z D Zhang |
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Affiliation: | (1) School of Science, Shenyang Ligong University, Shenyang, 110168, People’s Republic of China;(2) Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Centre for Materials Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, People’s Republic of China |
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Abstract: | In Fe0.75Mn1.35As compound, a metamagnetic transition from an antiferromagnetic phase to a ferrimagnetic phase can be induced above its phase
transition temperature T
s = 165 K by an external magnetic field, which leads to large magnetocaloric effects around T
s. The sign of the magnetic entropy change ΔS
M in the Fe0.75Mn1.35As compound is negative, not as expected as an inverse magnetocaloric effect, and the maximum value of ΔS
M 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. |
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Keywords: | |
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