Abstract
Soft magnetic composites (SMCs) based on flaky amorphous and nanocrystalline powders have less applications in SMCs than conventional alloys due to their insufficient stress relief during low-temperature annealing and relatively low comprehensive electromagnetic properties. Here, transverse and longitude magnetic field assisted annealing (MFAA) processes are applied for FeSiB amorphous and FeSiBCuNb nanocrystalline SMCs. Excellent electromagnetic performance of the amorphous/nanocrystalline SMCs can be obtained by MFAA. The SMCs of FeSiB treated by longitude field with induced current of 40 A and FeSiBCuNb treated by transverse field of 750 Gs exhibit high effective permeability of 41 and 68 at 100 kHz, and low core loss of 304 and 149 mW/cm3 at 100 kHz and 50 mT, respectively. Dynamic magnetic domain observation and loss separation are carried out to reveal the physical mechanisms for the property enhancement. Strip-like domain with small size and smooth edge appear in the amorphous/nanocrystalline SMCs after MFAA, indicating the induced magnetic anisotropy. The loss separation results show that the MFAA can induce the magnetic anisotropy, effectively improve the permeability and reduce the core loss of SMCs. This work provides an insightful understanding of magnetic field heat treatment on the electromagnetic properties for amorphous and nanocrystalline SMCs.
Published Version
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