Linked from
The 18 pages that link to Exchange interaction, each with the reason it gives.
FerromagnetismRelated: Its energy favors parallel neighboring spins in common ferromagnets.
Magnetic domainRelated: It aligns neighboring moments, helping create a uniformly magnetized region.
MagnetismRelated: It can align atomic moments into ordered magnetic states.
Heisenberg modelRelated: It produces the effective coupling between neighboring spins.
Permanent magnetRelated: It drives the collective alignment underlying ferromagnetism.