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.
Phases are how atoms are arranged in a material and roughly depend on temperature and other electromagnetic fields the material has gone through. Not easy to explain without introducing many new concepts.
Exactly, but like I said that’s not what I think they are referring to, nor the “electromagnetic phase”. Its just a third “magnetic phase”