Abstract

The flux losses of NdFeB and SmCo magnetic thick films at elevated temperatures were examined. Besides the temperature coefficient of B r that describes a reversible loss of flux with increasing temperature, irreversible losses occur. Long-term tests performed at 100–140°C demonstrate that the large total flux loss of films made of fine-milled melt-spun MQP-B powders are mainly due to the affinity to corrosion of the fine-milled powders. Films made of atomized MQP-S and SmCo powders show small losses (e.g. 1% at 100°C, 1700 h).

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