The fact that this proper
The fact that this property emerges from interaction with regions separated by Néel or Bloch walls is demonstrated by the Barkhausen effect. Lithium gas has been shown to exhibit this property at low temperatures. A statistical model named for Ising describes the phase changes in this property. Hysteresis allows this property to persist until an external effect, such as heat, is applied. For 10 points, name this effect, which disappears completely above the Curie temperature, exhibited by substances such as cobalt and iron.
The fact that this property emerges from interaction with regions separated by Néel or Bloch walls is demonstrated by the Barkhausen effect.
{Ferromagnet}ism