MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Extremely Large Magnetic Entropy Change of MnAs1-xSbx near Room Temperature
Hirofumi WadaKentaro TaniguchiYuji Tanabe
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2002 Volume 43 Issue 1 Pages 73-77

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Abstract

Magnetization of MnAs1−xSbx was measured as functions of temperature and magnetic field for 0≤x≤0.4. The entropy change caused by a magnetic field, ΔSmag, was estimated on the basis of the Maxwell relation. The ΔSmag for 0≤x≤0.3 in a field change of 5 T reaches 25–30 J/K kg, which exceeds that of other materials by a factor of 2–4. The substitution of Sb for As can tune the Curie temperature between 230 K and 315 K without any significant reduction of ΔSmag. The large ΔSmag originates in a paramagnetic to ferromagnetic transition induced by a magnetic field. These results indicate that MnAs1−xSbx is a promising material for a working substance in magnetic refrigeration near room temperature.

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© 2002 The Japan Institute of Metals and Materials
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