Why do cobalt-based alloys maintain magnetic properties at high temperatures?

Cobalt-based alloys maintain their magnetic properties at high temperatures primarily because cobalt possesses the highest Curie point of any metal or alloy, reaching 1,121 °C (2,050 °F). The Curie point is the critical temperature above which a material's ferromagnetic properties are weakened or lost; because cobalt’s threshold is exceptionally high, it remains ferromagnetic at temperatures where other metals would lose their magnetic orientation.12

In addition to this inherent property, cobalt is frequently used in the production of specialized magnetic alloys, such as the Alnicos, which are designed to retain their performance characteristics in demanding environments. By incorporating cobalt into these alloys, manufacturers can create materials that are stable and effective in applications requiring magnetic functionality at elevated temperatures.23