Quoth Cecil:
“The difference is that in the big magnets the tiny magnets are organized, i.e., they’re all lined up with their north poles in one direction and their south poles in the opposite direction. In an ordinary ferromagnetic material, the tiny magnets are scattered every which way, and their magnetic fields cancel each other out, so no magnetism overall.”
[…]
“Well, in chromium and manganese, each atom with “up” magnetism is paired with an atom of “down” magnetism, cancelling out the magnetism of the substance as a whole. In iron, however, all the atomic magnets point in the same direction, so it does (or can) have magnetism overall.”
Huh?
Leo Fabriek,
The Netherlands