Controlling stable Bloch points with electric currents
Controlling stable Bloch points with electric currents
The Bloch point is a point singularity in the magnetisation configuration, where the magnetisation vanishes. It can exist as an equilibrium configuration and plays an important role in many magnetisation reversal processes. In the present work, we focus on manipulating Bloch points in a system that can host stable Bloch points—a two-layer FeGe nanostrip with opposite chirality of the two layers. We drive Bloch points using spin-transfer torques and find that Bloch points can move collectively without any Hall effect and report that Bloch points are repelled from the sample boundaries and each other. We study pinning of Bloch points at wedge-shaped constrictions (notches) in the nanostrip and demonstrate that arrays of Bloch points can be moved past a series of notches in a controlled manner by applying consecutive current pulses of different strength. Finally, we simulate a T-shaped geometry and demonstrate that a Bloch point can be moved along different paths by applying current between suitable strip ends.
DMI, chiral magnetism, micromagnetic simulation
Lang, Martin
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Pathak, Swapneel Amit
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Holt, Samuel J.R.
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Beg, Marijan
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Fangohr, Hans
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2 November 2023
Lang, Martin
4b5ae654-6a58-4c2c-a116-87161fcd533d
Pathak, Swapneel Amit
3ca2b973-dd1a-4d56-bb5f-6b32230fe6a0
Holt, Samuel J.R.
7f359d0c-ccdd-4595-933d-0d0a5325be2c
Beg, Marijan
5c2effab-874f-41f7-957b-70974d1465a6
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Lang, Martin, Pathak, Swapneel Amit, Holt, Samuel J.R., Beg, Marijan and Fangohr, Hans
(2023)
Controlling stable Bloch points with electric currents.
Scientific Reports, 13 (1), [18934].
(doi:10.1038/s41598-023-45111-5).
Abstract
The Bloch point is a point singularity in the magnetisation configuration, where the magnetisation vanishes. It can exist as an equilibrium configuration and plays an important role in many magnetisation reversal processes. In the present work, we focus on manipulating Bloch points in a system that can host stable Bloch points—a two-layer FeGe nanostrip with opposite chirality of the two layers. We drive Bloch points using spin-transfer torques and find that Bloch points can move collectively without any Hall effect and report that Bloch points are repelled from the sample boundaries and each other. We study pinning of Bloch points at wedge-shaped constrictions (notches) in the nanostrip and demonstrate that arrays of Bloch points can be moved past a series of notches in a controlled manner by applying consecutive current pulses of different strength. Finally, we simulate a T-shaped geometry and demonstrate that a Bloch point can be moved along different paths by applying current between suitable strip ends.
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s41598-023-45111-5
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Published date: 2 November 2023
Additional Information:
Funding Information: this work was financially supported by the EPSRC Programme grant on Skyrmionics (EP/N032128/1). The OpenDreamKit Horizon 2020 European Research Infrastructures project (#676541) has contributed to the Ubermag software, which was used heavily in this work. We acknowledge the use of the HPC system at the Max Planck Institute for the Structure and Dynamics of Matter, in the completion of this work.
Keywords:
DMI, chiral magnetism, micromagnetic simulation
Identifiers
Local EPrints ID: 485884
URI: http://eprints.soton.ac.uk/id/eprint/485884
ISSN: 2045-2322
PURE UUID: 6db8f896-af03-40b6-a1a0-8a361a281a82
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Date deposited: 03 Jan 2024 20:16
Last modified: 18 Mar 2024 03:57
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Contributors
Author:
Martin Lang
Author:
Swapneel Amit Pathak
Author:
Samuel J.R. Holt
Author:
Marijan Beg
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