Particle-size distribution modified effective medium theory and validation by magneto-dielectric Co-Ti substituted BaM ferrite composites
Abstract
This letter reports an extended effective medium theory (EMT) including particle-size distribution functions to maximize the magnetic properties of magneto-dielectric composites. It is experimentally verified by Co-Ti substituted barium ferrite (BaCoxTixFe12-2xO19)/wax composites with specifically designed particle-size distributions. In the form of an integral equation, the extended EMT formula essentially takes the size-dependent parameters of magnetic particle fillers into account. It predicts the effective permeability of magneto-dielectric composites with various particle-size distributions, indicating an optimal distribution for a population of magnetic particles. The improvement of the optimized effective permeability is significant concerning magnetic particles whose properties are strongly size dependent.
- Publication:
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Journal of Magnetism and Magnetic Materials
- Pub Date:
- May 2018
- DOI:
- 10.1016/j.jmmm.2018.01.013
- Bibcode:
- 2018JMMM..453...44L
- Keywords:
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- Magneto-dielectric composites;
- Effective medium theory;
- Particle-size distribution