= Magnetism
Phenomena involving <magnetic fields>, including those produced by <electric currents> and <magnetic moments>.
A small total <magnetic moment> can hide extensive <magnetic order>. Compare three questions: are the individual <magnetic moments> nonzero, how are their directions correlated, and what is their <vector> sum? <Ferromagnetism>, <antiferromagnetism>, and <ferrimagnetism> answer the second question differently. The third question alone cannot identify the order.
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