Abstract
In this study we present evolution of the soft magnetic behavior in nanocrystalline (Fe64Co21B15)99Cu1 high-Bs alloy after long-term exposure to elevated temperatures (200 and 250 °C). The investigated ribbons exhibit excellent stability of the soft magnetic properties after thermal aging for 100 h at 200 °C both under vacuum and ambient air conditions. Our results show that the rise of ageing temperature to 250 °C has led to a noticeable increase of coercivity for the air-annealed ribbon only, indicating an appreciable role of surface oxidation process.
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