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Large low-field inverse magnetocaloric effect near room temperature in Ni50−x Mn37+x In13 Heusler alloys

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Abstract

Low field inverse magnetocaloric effect (IMCE) associated with first-order martensitic transition in Ni50−x Mn37+x In13 (x=3,4,5) alloys was investigated. By tuning the composition of Ni/Mn, large change in the magnetization occurring between martensite and austenite phases in a narrow temperature interval was achieved, which results in large IMCE. Under low magnetic field change of 2 T, a large positive magnetic entropy change (ΔS M ) of 23.5 J/kg K with a net refrigeration capacity of 53 J/kg was obtained near room temperature (308 K) in the x=3 alloy. The results show that a small variation in Ni/Mn ratio significantly influences the martensitic transition temperature and the associated magnetic and magnetocaloric properties.

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Author notes

  1. R. Gopalan

    Present address: National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Japan

Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Hyderabad, 500 058, India

    N. V. Rama Rao, R. Gopalan & V. Chandrasekaran

  2. Department of Physics, Indian Institute of Technology Bombay, Mumbai, 400 076, India

    N. V. Rama Rao & K. G. Suresh

Authors
  1. N. V. Rama Rao
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  2. R. Gopalan
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  3. V. Chandrasekaran
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  4. K. G. Suresh
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Correspondence to N. V. Rama Rao.

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Rama Rao, N.V., Gopalan, R., Chandrasekaran, V. et al. Large low-field inverse magnetocaloric effect near room temperature in Ni50−x Mn37+x In13 Heusler alloys. Appl. Phys. A 99, 265–270 (2010). https://doi.org/10.1007/s00339-009-5517-3

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  • DOI: https://doi.org/10.1007/s00339-009-5517-3

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