Demonstration of weighted sum using electrical manipulation and detection of magnetic skyrmions

da Câmara Santa Clara Gomes, Tristan [UCL] Sassi, Yanis Krishnia, Sachin Sanz-Hernandez, Dedalo Reyren, Nicolas Martin, Marie-Blandine Seneor, Pierre Bhatnagar-Schöffmann, Tanvi Ravelosona, Dafiné Querlioz, Damien Herrera-Diez, Liza Grollier, Julie Cros, Vincent et al.[show all]

Thanks to their original properties, magnetic skyrmions have many promising applications, from memories, sensors to logic operations. In this study, we propose to use fully-electrical manipulation and detection of magnetic skyrmions in multilayer devices to perform a basic unconventional computation operation in hardware. The fabricated devices take advantage of the particle-like nature of the magnetic skyrmions: operations can be applied to a large ensemble of skyrmions using fully-electrical stimuli, while skyrmions can be counted individually by electrical means. Here, we show the nucleation and the motion of a controlled number of magnetic skyrmions in multilayer tracks using electrical current pulse parameters. Then, we show that the number of skyrmions can be directly summed and detected with non-perturbative Anomalous Hall resistance measurements. Magneto-ionic effects are used for the local non-volatile and reversible tuning of the magnetic properties of the tracks.