Title: Skyrmions in Spin-Orbitronics and Orbitronics- Novel Science and Applications in Memory& Non-Conventional Computing
Abstract: Novel spintronic devices can play a role in the quest for GreenIT if they are stable and can transport and manipulate spin with low power. Devices have been proposed, where switching by energy-efficient approaches is used to manipulate topological spin structures [1,2].
We combine ultimate stability of topological states due to chiral interactions [3,4] with ultra-efficient manipulation using novel spin torques [3-5]. In particular orbital torques [6] increase the switching efficiency by more than a factor 10.
We use skyrmion dynamics for non-conventional stochastic computing applications, where we developed skyrmion reshuffler devices [7] based on skyrmion diffusion that can be enhaced by excitations [8]. Diffusion allows us to probe the energy landscape of a sample and reveals the origin of skyrmion pinning [7,8]. Such diffusion can furthermore be used for Token-based Brownian Computing and Reservoir Computing [9].
References
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[3] S. Woo et al., Nature Mater., vol. 15, no. 5, pp. 501-506, 2016.
[4] K. Litzius et al., Nature Phys., vol. 13, no. 2, pp. 170-175, 2017.
[5] K. Litzius et al., Nature Electron., vol. 3, no. 1, pp. 30-36, 2020.
[6] S. Ding et al. Phys. Rev. Lett. 125, 177201, 2020; Phys. Rev. Lett. 128, 067201, 2022.
[7] J. Zázvorka et al., Nature Nanotechnol., vol. 14, no. 7, pp. 658-661, 2019;
R. Gruber et al., Nature Commun. vol. 13, pp. 3144, 2022.
[8] R. Gruber et al., Adv. Mater. 35, 2208922 (2023)
[9] K. Raab et al., Nature Commun. vol. 13, pp. 6982, 2022;
M. Brems et al., Appl. Phys. Lett. 119, 132405, 2021