Abstract
Structural and soft magnetic response of nanocrystalline (Fe 1− x Co x ) 73.5Cu 1Nb 3Si 13.5B 9 ( x = 0, 0.25, 0.5, 0.75) alloys were investigated. Influences of heat treatment and Co content on the crystallization were analyzed through estimation of the crystalline volume fraction V cr and thickness of the intergranular amorphous layer Λ from XRD patterns. High-temperature soft magnetic response was analyzed by the temperature evolution of the magnetic permeability from room temperature to 780 °C. It was found that the high-temperature soft magnetic behavior is improved with increasing Co content for x ≤ 0.5, which is ascribed to reinforcing magnetic coupling between the crystals, however, a decrease of μ i was observed for the Co richest sample. The observed μ i behavior as a function of Co content is interpreted in terms of variations in the degree of exchange coupling.
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