• SmoothOperator@lemmy.world
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    20 hours ago

    I have no idea about the numbering, but I know of at least

    • Ferromagnetism (like a fridge magnet)
    • Antiferromagnetism (opposite of ferromagnetism at an atomic level)
    • Diamagnetism (makes superconductors float)
    • Paramagnetism (like that spinny frog)

    These all indicate how a material reacts to a magnetic field. This article discusses “altermagnetism”, which is somewhere between ferromagnetism and antiferromagnetism.