Topological analysis and experimental control of transformations of domain walls in magnetic cylindrical nanowires

Topology is a powerful tool for categorizing magnetization textures by defining a topological index in both two-dimensional (2D) systems, such as thin films or curved surfaces, and in 3D bulk systems. In the emerging field of 3D nanomagnetism, both volume and surface topological numbers must be considered, requiring the identification of a proper global topological invariant to support categorization. Here we consider domain walls in cylindrical nanowires as an excellent playground for 3D nanomagnetic systems, excited by a charge current, that generates an Œrsted field. We first provide experimental evidence of previously unreported domain-wall transformations of topology occurring at the nanosecond timescale. We investigate these transformations with micromagnetic simulations, tracking both bulk and surface topological signatures. We demonstrate a topological invariant combining both signatures, while the topological charge varies from bulk to surface during the dynamics. The experimental change of topology is reproduced when the pulse duration matches the timescale of the internal transformations of the wall, and the current is switched off before the transformation is complete. We expect that the topological categorization and dynamical exploitation apply to any 3D nanomagnetic system.

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Publication Details

Journal
Physical Review Research
Published
2025-04-28
DOI
https://doi.org/10.1103/physrevresearch.7.023092
Citations
5
Primary Topic
Magnetic properties of thin films
Type
article
Field-Weighted Citation Impact
6.23

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article

Topological analysis and experimental control of transformations of domain walls in magnetic cylindrical nanowires

C. Thirion, Jean-Christophe Toussaint, Olivier Fruchart, Jérôme Hurst et al.
5 citations
Physical Review Research
Magnetic properties of thin films
6.23
article

Topological analysis and experimental control of transformations of domain walls in magnetic cylindrical nanowires

C. Thirion, Jean-Christophe Toussaint, Olivier Fruchart, Jérôme Hurst, Aurélien Massebœuf, Lucía Aballe, Daria Gusakova, Sandra Ruiz‐Gómez, Laura Álvaro-Gómez, Eva Pereiro, Lucas Pérez, S. Hegde
article en
5 citations

Abstract

Topology is a powerful tool for categorizing magnetization textures by defining a topological index in both two-dimensional (2D) systems, such as thin films or curved surfaces, and in 3D bulk systems. In the emerging field of 3D nanomagnetism, both volume and surface topological numbers must be considered, requiring the identification of a proper global topological invariant to support categorization. Here we consider domain walls in cylindrical nanowires as an excellent playground for 3D nanomagnetic systems, excited by a charge current, that generates an Œrsted field. We first provide experimental evidence of previously unreported domain-wall transformations of topology occurring at the nanosecond timescale. We investigate these transformations with micromagnetic simulations, tracking both bulk and surface topological signatures. We demonstrate a topological invariant combining both signatures, while the topological charge varies from bulk to surface during the dynamics. The experimental change of topology is reproduced when the pulse duration matches the timescale of the internal transformations of the wall, and the current is switched off before the transformation is complete. We expect that the topological categorization and dynamical exploitation apply to any 3D nanomagnetic system.

Physical Review ResearchVol. 7(2)
Madrid Institute for Advanced Studies (ES), Universidad Complutense de Madrid (ES), University of Mumbai (IN), ALBA Synchrotron (Spain) (ES), Max Planck Institute for Chemical Physics of Solids (DE), Spintronique et Technologie des Composants (FR), Institut Néel (FR), Institut des langues et cultures d'Europe, Amérique, Afrique, Asie et Australie (FR), Université Grenoble Alpes (FR)
Alexander von Humboldt-Stiftung, Marie Curie, Agence Nationale de la Recherche, Centre National de la Recherche Scientifique, Agencia Estatal de Investigación
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Openalex Percentile: Top 4%
Magnetic properties of thin films
6.23
DOIOpen Access PDFOpenAlex
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