  It is well established that it is possible to switch certain antiferromagnets
electrically, yet the interplay of N\'{e}el-spin-orbit torques and thermal
activation is only poorly understood. Combining ab initio calculations and
atomistic spin dynamics simulations we develop a multiscale model to study the
current induced switching in Mn2Au. We compute from first principles the
strength and direction of the electrically induced magnetic moments, caused by
the Rashba--Edelstein effect, and take these into account in atomistic spin
dynamics simulations. Our simulations reveal the switching paths as well as the
time scales for switching. The size of the induced moments, however, turns out
to be insufficient to lead to fully deterministic switching. Instead, we find
that a certain degree of thermal activation is required to help overcoming the
relevant energy barrier.
