The aforementioned effect is often shown as an S-shaped loop and is called hysteresis.
A pioneering theorist in the study of these materials was Pierre-Ernest Weiss, though explaining them required the understanding of exchange interactions in quantum theory. One phenomenon associated with them can be measured in a Rowland (ROH-lund) ring, and these materials can be described by the spherical or Ising ("icing") models. The aforementioned effect is often shown as an S-shaped loop and is called hysteresis. These materials are comprised of re- gions with aligned moments that break down above the Curie temperature and are called domains. With examples like cobalt, nickel, and its namesake element, name this phenomenon contrasted with diamagnetism and paramagnet- ism.
A pioneering theorist in the study of these materials was Pierre-Ernest Weiss, though explaining them required the understanding of exchange interactions in quantum theory.
{ferromagnets} [accept word forms, {e.g. ferromagnetism} or {ferromagnetic}; prompt on {magnets} or word