Properties of magnetocaloric materials with a distribution of Curie temperatures

Christian Robert Haffenden Bahl, Rasmus Bjørk, Anders Smith, Kaspar Kirstein Nielsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The magnetocaloric properties of inhomogeneous ferromagnets that contain distributions of Curie temperatures are considered as a function of the width of such a distribution. Assuming a normal distribution of the Curie temperature, the average adiabatic temperature change, ΔTad, the isothermal magnetic entropy change, Δs, and the heat capacity, cp, in zero magnetic field and an applied magnetic field of , have been calculated using the mean field model of ferromagnetism. Interestingly, both the peak position and amplitude of each of these parameters vary differently with the width of the distribution, explaining the observed mismatch of peak temperatures reported in experiments. Also, the field dependence of ΔTad and Δs is found to depend on the width of the distribution.
    Original languageEnglish
    JournalJournal of Magnetism and Magnetic Materials
    Volume324
    Issue number4
    Pages (from-to)564-568
    ISSN0304-8853
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Magnetic cooling

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