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Fine-particle composites consisting of high-permeability particles with a large size difference exhibit enhanced initial permeability. From an analysis of the initial permeability of a composite that includes Fe (1 micron) particles as a main component, we found that the microscopic demagnetizing field imposed on the particles is appreciably reduced, allowing enhancement of the initial permeability up to the intrinsic permeability of Fe particles. The significance of this effect is exemplified using composites that include Ni50Fe50 (6 microns) and amorphous Fe-Si-B-Cr (3 microns) particles. According to a calculation of the eddy current in spheres with high permeability, reduction of the particle size to less than 1 micron is essential for further improvement of the high-frequency performance of particle composites.

Initial Permeability of Magnetically Soft Particles with Composite Structure