Abstract
A new family of Fe–Co based high temperature nanocrystalline alloy was developed using Fe 85− x Co x Nb 5 B 8 P 2 as a precursor amorphous material , which can be cast in air. The nanocrystalline sample presented a flat hysteresis loop with excellent high frequency and high temperature behaviour. The material crystallizes at relative low temperature (400°C), with a relatively low activation energy (2.7 eV) for x =20. The sample annealed at 500°C shows temperature independent soft magnetic properties (Hc around 40 A/m, relative permeability 450 up to 1 MHz) up to the applied annealing temperature.
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