what is the meaning of A type Anti Ferromagnet?

Question

anonymous · Answer

In materials that exhibit antiferromagnetism, the magnetic moments of atoms or molecules, usually related to the spins of electrons, align in a regular pattern with neighboring spins (on different sublattices) pointing in opposite directions. This is, like ferromagnetism and ferrimagnetism, a manifestation of ordered magnetism.

anonymous · Answer

The definition above is for any general antiferromagnet, but an A-type antiferromagnet is a specific type of antiferromagnet. A-type refers to materials in which the spins of each successive  atomic layer are anti-parallel.  Consider the attached diagram illustrating an A-type antiferromagnet.  Here you will see that the spin directions of each successive layer are opposite to their adjacent layers (that is they are antiparallel), which