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The simple answer is, it becomes weaker and weaker and eventually looses its magnetism. In a permanent magnet magnetic domains within the material are nearly all oriented in the same direction, amplifying the magnetic effect. As one heats this material, the domains become more random. When heated sufficiently high, to the CURIE POINT, the material loses all of its magnetism. If the material is then cooled in the presence of a magnetic field, it will be re-magnetized.

In some materials, heating to temperatures below the curie point will result in temporary loss of magnetism which will be regained as the material cools (reversible losses). Heating to temperatures below the curie point may also cause irreversible losses, ie, the magnetism does not return to its previous strength when cooled.

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Q: What happens when you heat a magnet too much?
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