Review on magnetic moment configurations

Magnetic moment configurations in some cases are reviewed to provide a quantitative understanding of magnetic structure in general. The discussion starts from the free energy consideration as a physical basis and proceeds to some 1-D moment configurations. The single-q vs multi-q cases is described in a 2-D cube system. The extension to their 3-D counterparts are straightforward. The conclusion is that it is possible to make arrangements for the moment configurations incommensurable with the underlying crystallographic structure and having either the single-q or multi-q magnetic structure. (author)