  Louis Neel pointed out in his Nobel lecture that while abundant and
interesting from a theoretical viewpoint, antiferromagnets did not seem to have
any applications. Indeed, the alternating directions of magnetic moments on
individual atoms and the resulting zero net magnetization make antiferromagnets
hard to control by tools common in ferromagnets. Remarkably, Neel in his
lecture provides the key which, as we show here, allows us to control
antiferromagnets by electrical means analogous to those which paved the way to
the development of ferromagnetic spintronics applications. The key noted by
Neel is the equivalence of antiferromagnets and ferromagnets for effects that
are an even function of the magnetic moment. Based on even-in-moment
relativistic transport phenomena, we demonstrate room-temperature electrical
switching between two stable configurations combined with electrical read-out
in antiferromagnetic CuMnAs thin film devices. Our magnetic memory is
insensitive to and produces no magnetic field perturbations which illustrates
the unique merits of antiferromagnets for spintronics.
