Editorial: Altermagnetism—A New Punch Line of Fundamental Magnetism

Non sunt multiplicanda entia sine necessitate, entities should not be multiplied without necessity. This observation made by the Franciscan monk John Punch in 1639 [1] still resonates with one of PRX's editorial philosophies: new terminology should only be introduced into papers when it advances understanding. Yet, the second Perspective article we have invited and are now publishing [2] seems to have done just the opposite. It introduces a new term into the century-old field of magnetism: "altermagnetism." PRX's authors and readers could rightly ask: Why make an exception here?