  A magnetic skyrmionium (also called 2$\pi$-skyrmion) can be understood as a
skyrmion - a topologically non-trivial magnetic whirl - which is situated in
the center of a second skyrmion with reversed magnetization. Here, we propose a
new optoelectrical writing and deleting mechanism for skyrmioniums in thin
films, as well as a reading mechanism based on the topological Hall voltage.
Furthermore, we point out advantages for utilizing skyrmioniums as carriers of
information in comparison to skyrmions with respect to the current-driven
motion. We simulate all four constituents of an operating skyrmionium-based
racetrack storage device: creation, motion, detection and deletion of bits. The
existence of a skyrmionium is thereby interpreted as a '1' and its absence as a
'0' bit.
