Explosion compacted FeCo particles coated with ferrites: A possible route to achieve artificial soft ferrites

The development of a method to coat soft ferromagnetic particles with a thin CoFe₂o₄ or NiFe₂O₄ layer was reported. The ferrite-coated particles were compacted into fully dense bulk material with density very close to the ideal value using explosion compaction technique. By impedance measurements of the compacted sample, it was found that the real part of the measured impedance was very high and decreased with increasing frequency much slower than a standard ferrite sample in the range of 1 kHz-100 MHz.