Domain wall dynamics in two-dimensional van der Waals ferromagnets

Abdul-Wahab, Dina, Iacocca, Ezio, Evans, Richard F. L., Bedoya-Pinto, Amilcar, Parkin, Stuart, Novoselov, Kostya S. and Santos, Elton J. G. (2021) Domain wall dynamics in two-dimensional van der Waals ferromagnets. Applied Physics Reviews, 8 (4). 041411. ISSN 1931-9401

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Domain wall motion is in the core of many information technologies ranging from storage [Beach et al., J. Magn. Magn. Mater. 320, 1272–1281 (2008)], processing [Tatara et al., Phys. Rep. 468, 213–301 (2008)], and sensing [Ralph and Stiles, J. Magn. Magn. Mater. 320, 1190–1216 (2008)] up to novel racetrack memory architectures [Parkin et al., Science 320, 190–194 (2008)]. The finding of magnetism in two-dimensional (2D) van der Waals (vdW) materials [Huang et al., Nature 546, 270 (2017); Gong et al., Nature 546, 265–269 (2017); Guguchia et al., Sci. Adv. 4, eaat3672 (2018); Klein et al., Science 360, 1218–1222 (2018)] has offered a new frontier for the exploration and understanding of domain walls at the limit of few atom-thick layers. However, to use 2D vdW magnets for building spintronics nanodevices such as domain-wall based logic [Allwood et al., Science 309, 1688–1692 (2005); Luo et al., Nature 579, 214–218 (2020); Xu et al., Nat. Nanotechnol. 3, 97–100 (2008)], it is required to gain control of their domain wall dynamics by external driving forces such as spin-polarized currents or magnetic fields, which have so far been elusive. Here, we show that electric currents as well as magnetic fields can efficiently move domain walls in the recently discovered 2D vdW magnets CrI3 and CrBr3 at low temperatures and robust down to monolayer. We realize field- and current-driven domain wall motion with velocities up to 1020 m s−1, which are comparable to the state-of-the-art materials for domain-wall based applications [Yang et al., Nat. Nanotechnol. 10, 221–226 (2015); Woo et al., Nat. Mater. 15, 501–506 (2016); Vélez et al., Nat. Commun. 10, 4750 (2019); Siddiqui et al., Phys. Rev. Lett. 121, 057701 (2018); Ryu et al., Nat. Nanotechnol. 8, 527–533 (2013)]. Domain walls keep their coherence driven by the spin-transfer torque induced by the current and magnetic fields up to large values of about

Item Type: Article
Additional Information: Funding information: R.F.L.E. acknowledges computational resources from the VIKING cluster provided by the University of York. E.J.G.S. acknowledges computational resources through CIRRUS Tier-2 HPC Service (ec131 Cirrus Project) CIRRUS@EPCC ( funded by the University of Edinburgh and EPSRC (No. EP/P020267/1); and ARCHER UK National Supercomputing Service ( via Project d429. E.J.G.S. acknowledges the EPSRC Early Career Fellowship (No. EP/T021578/1) and the University of Edinburgh for funding support. K.S.N. acknowledges support by the Ministry of Education (Singapore) through the Research Centre of Excellence program (Award EDUN C-33-18-279-V12, Institute for Functional Intelligent Materials) and The Royal Society, UK.
Uncontrolled Keywords: General Physics and Astronomy
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 09 Dec 2021 16:45
Last Modified: 29 Nov 2022 08:00

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