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Sci Rep. 2019 Aug 20;9(1):12119. doi: 10.1038/s41598-019-48617-z.

Electrical writing, deleting, reading, and moving of magnetic skyrmioniums in a racetrack device.

Author information

1
Max-Planck-Institut für Mikrostrukturphysik, D-06120, Halle, Saale, Germany. bgoebel@mpi-halle.mpg.de.
2
Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099, Halle, Saale, Germany. alexander.schaeffer@physik.uni-halle.de.
3
Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099, Halle, Saale, Germany.
4
Max-Planck-Institut für Mikrostrukturphysik, D-06120, Halle, Saale, Germany.

Abstract

A magnetic skyrmionium (also called 2π-skyrmion) can be understood as a skyrmion-a topologically nontrivial 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.

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