Curie Point or Curie Temperature demonstration

In this video we demonstrate how a piece of hot steel is not attracted by a magnet until it cools down to a point. This point is known as the Curie Point or Curie Temperature of that material. A heat-induced ferromagnetic-paramagnetic transition is used in magneto-optical storage media, for erasing and writing of new data. Famous examples include the Sony Minidisc format, as well as the now-obsolete CD-MO format.