  Spintronics in ferromagnetic metals is built on a complementary set of
phenomena in which magnetic configurations influence transport coefficients and
transport currents alter magnetic configurations. In this Letter we propose
that corresponding effects occur in circuits containing antiferromagnetic
metals. The critical current for switching can be smaller in the
antiferromagnetic case because of the absence of shape anisotropy and because
spin torques act through the entire volume of an antiferromagnet. Our findings
suggest that current-induced order parameter dynamics can be used to coarsen
the microstructure of antiferromagnetic thin films.
