Antiferromagnetic
Antiferromagnetism is a state in which the spin of electrons aligns uniformly with the adjacent spin and has no net magnetism. Generally, antiferromagnetic materials exhibit antiferromagnetic properties at low temperatures. And above a certain temperature the character disappears and becomes disordered. This transition temperature is called the Nehl temperature by the name of Luis Neel. At temperatures higher than the Nehl temperature, the antiferromagnet is paramagnetic. The behavior of antiferromagnetic at low temperature shows a characteristic of a semi-magnetic property, and sometimes many physically observable properties exhibit ferromagnetism. The permeability passes the maximum as the temperature declines.