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It depends on the type of magnet.

The Curie Point is the point above which a material cannot be a permanent magnet. For iron-type magnets, this is about 770C.

Of course, not all magnets are caused by ferromagnetism. An electric current produces a magnetic field, regardless of the temperature. The earth's core approaches a temperature of 5000 C, but the Earth still has a magnetic field caused by swirling currents in the core of the earth.

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