On the magnetostatics of chains of magnetic nanoparticles

C. Phatak, R. Pokharel, Marco Beleggia, M. De Graef

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A novel approach is presented for the computation of the magnetostatic energy of straight and bent chains of identical, uniformly magnetized particles of arbitrary shape. The formalism relies on the concept of the magnetometric tensor field, and allows for closed form expressions for the magnetostatic energy, demagnetization factor, Young's modulus, and bending modulus of chains in terms of the shape amplitude of the particles. Analytical solutions are presented for straight chains of spheres, cubes, and cylinders, and for bent chains of spheres. Numerical results include chains of octahedra, tetrahedra, cuboctahedra, and bi-cones. The axial demagnetization factor for the bi-cone shape is derived in analytical form. An approximate energy expression, using the full shape-dependent interaction formalism for short separation distances, and the standard dipolar interaction expression for larger distances, is introduced.
    Original languageEnglish
    JournalJournal of Magnetism and Magnetic Materials
    Volume323
    Issue number22
    Pages (from-to)2912-2922
    Number of pages11
    ISSN0304-8853
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Magnetic chain
    • Magnetostatic interaction
    • Shape amplitude

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