Physicists have uncovered a hidden third form of magnetism that challenges more than 100 years of established physics. Called altermagnetism, the discovery could transform future computing and electronics while opening an entirely new frontier in quantum research.

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[–] 2 points 6 days ago

Ferromagnets have many molecule level magnets which align poles with other fields and antiferromagnets have opposing molecular magnets which cause all magnetic interaction to cancel out to zero.

So they're names of pole alignment types.

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