Demagnetizing effects in stacked rectangular prisms

Dennis Christensen, Kaspar Kirstein Nielsen, Christian Robert Haffenden Bahl, Anders Smith

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    Abstract

    A numerical, magnetostatic model of the internal magnetic field of a rectangular prism is extended to the case of a stack of rectangular prisms. The model enables the calculation of the spatially resolved, three-dimensional internal field in such a stack given any magnetic state function, stack configuration, temperature distribution and applied magnetic field. In this paper the model is applied to the case of a stack of parallel, ferromagnetic rectangular prisms and the resulting internal field is found as a function of the orientation of the applied field, the number of prisms in the stack, the spacing between the prisms and the packing density of the stack. The results show that the resulting internal field is far from being equal to the applied field and that the various stack configurations investigated affect the resulting internal field significantly and non-linearly. The results have a direct impact on the design of, e.g., active magnetic regenerators made of stacked rectangular prisms in terms of optimizing the internal field.
    Original languageEnglish
    JournalJournal of Physics D: Applied Physics
    Volume44
    Issue number21
    Pages (from-to)215004
    ISSN0022-3727
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Magnetic refrigeration

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