❓ why
Why does a permanent magnet lose its strength when heated?
Quick Answer
Heating makes the atoms in a magnet vibrate more, which disrupts the alignment of its magnetic domains. If it is heated enough, it can reach the Curie temperature and lose ferromagnetism.
The Full Story
Permanent magnets work because many tiny magnetic domains point in the same direction. As temperature rises, thermal motion shakes those domains out of alignment. At a material-specific Curie temperature, the ordered magnetic state breaks down and the magnet can no longer stay strongly magnetized. For iron, the Curie temperature is about 770°C, though exact values vary by material.
Key Facts
1.Iron’s Curie temperature is about 770°C
2.Magnetic domains need alignment to produce a strong permanent magnet
3.Heat can partially or permanently demagnetize a magnet
YouTube Angle
Suggested video title for this topic:
"Why does heat erase a magnet’s strength?"
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