  Electric field control of magnetic anisotropy in ferromagnets has been
intensively pursued in spintronics to achieve efficient memory and computing
devices with low energy consumption. Compared with ferromagnets,
antiferromagnets hold huge potential in high-density information storage for
their ultrafast spin dynamics and vanishingly small stray field. However, the
switching of magnetic anisotropy of antiferromagnets via electric field remains
elusive. Here we use ferroelastic strain from piezoelectric materials to switch
the uniaxial magnetic anisotropy and the N\'eel order reversibly in
antiferromagnetic Mn2Au films with an electric field of only a few kV/cm at
room temperature. Owing to the uniaxial magnetic anisotropy, a ratchet-like
switching behavior driven by the N\'eel spin-orbit torque is observed in the
Mn2Au, which can be reversed by electric fields.
