  We experimentally demonstrate a proof-of-principle implementation of an
almost ideal memristor - a two-terminal circuit element whose resistance is
approximately proportional to the integral of the input signal over time. The
demonstrated device is based on a thin-film ferromagnet/antiferromagnet
bilayer, where magnetic frustration results in viscous magnetization dynamics
enabling memristive functionality, while the external magnetic field plays the
role of the driving input. The demonstrated memristor concept is amenable to
downscaling and can be adapted for electronic driving, making it attractive for
applications in neuromorphic circuits.
