Abstract
The crystallization effect of Fe-based nanocrystalline on the electromagnetic (EM) wave absorption behavior has been investigated. Amorphous ribbons were annealed at temperatures ranging from 500°C to 650°C for 1 hour to investigate the crystallization behavior. The grain size was in the range from 10 to 20nm as the specimen was annealed under 600°C, while it significantly increased when annealed above the temperature. The initial permeability increased with volume fraction of bcc-Fe(Si) phase and showed a maximum at fc∼0.77. The optimized magnetic properties of nanocrystalline ribbons can be acquired when they were crystallized at 550-560°C for 1 hour. However, the EM wave absorption properties in a sheet made of the nanocrystalline powder was greatest in the specimen crystallized at 510°C for 1hour annealing, indicating that the pulverization and milling process lowered the optimum crystallization condition.
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