Abstract
We investigate if the demagnetization factor for a randomly packed
powder of magnetic spheroidal particles depend on the shape of the
spheroidal particles and what the internal variation in magnetization is
within such a powder. A spheroid is an ellipsoid of revolution, i.e. an
ellipsoid with two semi-major axis being equal. The demagnetization
factor is calculated as function of particle aspect ratio using two
independent numerical models for several different packings, and
assuming a relative permeability of 2. The calculated demagnetization
factor is shown to depend on particle aspect ratio, not because of
direct magnetic interaction but because the particle packing depend on
the aspect ratio of the particles. The relative standard deviation of
the magnetization across the powder was 3–8%, increasing as the particle
shape deviates from spherical, while the relative standard deviation
within each particle was relatively constant around 5%.
Original language | English |
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Journal | Journal of Magnetism and Magnetic Materials |
Volume | 476 |
Pages (from-to) | 417-422 |
ISSN | 0304-8853 |
DOIs | |
Publication status | Published - 2019 |