Abstract
The structural and magnetic properties of amorphous Fe87−yB13Cuy (y=0 to 1.5) annealed with a range of heating rates (α) up to 150K/s were investigated. The lowest coercivity (Hc) for Fe87B13 after crystallization shows a dramatic decrease from 174A/m to 6.7A/m when α is increased from 1.7K/s to 150K/s. The coercivity of Fe87−yB13Cuy annealed at 150K/s is reduced by Cu addition and Hc=3.0A/m is obtained at y=1.5. Nanostructures with a grain size of 15 to 20nm were evident in transmission electron micrographs from these rapidly annealed alloys.
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