Effect of Antisymmetric Exchange Interaction on the Magnetization and Resonance in Antiferromagnets

摘要: The magnetization curves and the resonance frequencies are calculated for two types of antiferromagnets with an antisymmetric exchange interaction form ${\mathbf{D}}_{\mathrm{ij}}\ifmmode\cdot\else\textperiodcentered\fi{}{\mathbf{M}}_{i}\ifmmode\times\else\texttimes\fi{}{\mathbf{M}}_{j}$ a uniaxial magnetocrystalline anisotropy term $K {sin}^{2}\ensuremath{\theta}$. In one type these antiferromagnets, D vector is perpendicular to easy axis. This presumably case in orthoferrites. For this case, we have frequency as function external field applied parallel second lies situation hematite below Morin temperature. plane both cases obtained modes, lower mode was found ${W}_{\ensuremath{-}}=0$ characteristic critical field, at which antiferromagnetic axis becomes