Antiferromagnetism
In materials that exhibit antiferromagnetism, the spins of magnetic electrons align in a regular pattern with neighboring spins pointing in opposite directions. This is the opposite of ferromagnetism. Generally, antiferromagnetic materials exhibit antiferromagnetism at a low temperature, and become disordered above a certain temperature; the transition temperature is called the Neel temperature. Above the Neel temperature, the material is typically paramagnetic.
Antiferromagnetic materials have a negative coupling between adjacent moments and low frustration.
Antiferromagnetic materials are relatively uncommon. An example is the heavy-fermion superconductor URu2Si2.
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