Yeah, and it's not even an accurate explanation either.
> The common one, the fridge magnet, is ferromagnetic — its atomic magnets all point the same way (up or down), adding their magnetic effects.
Ferromagnets typically have domains with magnetic moments that point in different directions. Ferromagnets rarely have every 'atomic magnet' pointing the same way.
Refrigerator magnets in particular are usually magnetized as Halbach arrays, where the whole point is that the 'atomic magnets' are not pointing in the same direction. This is more energetically stable, which allows you to use cheaper materials.
Lastly, I believe most refrigerator magnets are actually ferrimagnetic, not ferromagnetic. (The distinction doesn't matter much for users of magnets, but is important for the materials scientists studying and designing them.)
- Superconductor quantum interference devices (SQUIDs) use the quantization of superconducting electron tunneling to measure tiny amounts of magnetic field, as little as a millionth of a flux quantum: https://en.wikipedia.org/wiki/SQUID
- Ferromagnetism is intrinsically a quantum phenomenon; spin is quantized and iron's magnetism is explained, in part, from electrons being identical particles that obey the exclusion principle: https://farside.ph.utexas.edu/teaching/sm1/Thermalhtml/node8...
- Despite the "super", superconductors are mostly not used in the world's strongest electromagnets, as they have limits on the current and magnetic fields they can take
Was this at me or tedsanders? My quick research on ted shows he appears to be real, and you can easily look at my history to see I'm human. If at me, I'm honored - first time being aicused
