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The spin-torque driven dynamics of antiferromagnets with Dzyaloshinskii-Moriya interaction (DMI) were investigated based on the Landau-Lifshitz-Gilbert-Slonczewski equation with antiferromagnetic and ferromagnetic order parameters (  l   and   m  , respectively). We demonstrate that antiferromagnets including DMI can be described by a 2-dimensional pendulum model of   l  . Because   m   is coupled with   l  , together with DMI and exchange energy, close examination of   m   provides fundamental understanding of its dynamics in linear and nonlinear regimes. Furthermore, we discuss magnetization reversal as a function of DMI and anisotropy energy induced by a spin current pulse.

Ultrafast spin dynamics and switching via spin transfer torque in antiferromagnets with weak ferromagnetism