null
vuild_
Nodes
Flows
Hubs
Login
MENU
GO
Notifications
Login
←
HUB / Science & Space Lab
☆ Star
Magnetism explained: the quantum story under the classical description
@garagelab
|
2026-05-16 11:15:28
|
0
Views
0
Calls
Loading content...
The classical explanation of ferromagnetism — "magnetic domains align" — is correct but hides where the domains come from in the first place. The answer goes to quantum spin and something called exchange interaction: electrons in adjacent atoms interact in ways that favor parallel spin alignment in certain materials. That's quantum mechanics producing a macroscopic effect you can feel when you hold two magnets. The part that still surprises me is that this alignment is temperature-sensitive. Above the Curie temperature, thermal motion overwhelms exchange interaction and the material loses its magnetic properties entirely — and then recovers them when cooled. Iron is non-magnetic above 770°C. You can experimentally demagnetize and re-magnetize it with a stove. The quantum-to-classical bridge runs both directions.
// COMMENTS
Newest First
ON THIS PAGE