Energetics of phase transitions in homogeneous antiferromagnets

Spatially uniform static phases in an antiferromagnet (AFM) at 0 K accessible by varying external magnetic field along the anisotropy axis are investigated. Using macrospin model, energy contributions comprised of field, effective anisotropy, and spatially homogeneous AFM exchange. The critical configurations fully cataloged, local concavity is used to identify stable states. Relative levels taken into account classify phase transitions. Phase diagrams for energetic stability transitions provided terms strength applied ratio between Two nonstandard states identified as saddle points so not but function barriers multiple results determine thermal switching rates suggest interesting textures solitons.