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.
So first is ferromagnetic, second is electromagnetic, and third is altermagnetic?
Not really: ferromagnetic, anti-ferromagnetic, and altermagnetic. Electromagnetism covers the entire field (pun!) generally.