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https://www.magnetsw.com/products/alnico-pot-magnet/

The magnetic core in a pot magnet is AlNiCo material. As the good temperature resistance, AlNiCo pot magnets are ideal for all types of holding, mounting, and fixing applications.

Alnico Pot Magnet With Good Temperature Resistance
Of all magnetic materials, Alnico has the best temperature coefficient of magnetic induction, so its magnet performance decreases only slightly as the magnet warms up.
However, when the temperature rises too high, the materials that make up the Alnico pot magnet become loose. As different materials have different coefficients of expansion, it should be caution when using at temperatures above 200°C.