Generation of Bloch Points with Controlled Spin Texture Using Geometrical Boundary Conditions
Abstract Bloch points are three-dimensional topological singularities in magnetization that play a key role in topological transformations of spin textures such as skyrmion creation or annihilation. While topology often enforces the existence of Bloch points in confined geometries such as cylindrical nanowires, deterministic control over their position and magnetic configuration remains challenging. Here, we demonstrate the generation of Bloch points with controlled spin texture by engineering geometrical boundary conditions in three-dimensional nanomagnets. By introducing a chirality interface between two three-dimensional double-helix nanowires of opposite handedness, forming a kinked, noncollinear structure, we impose competing topological constraints that uniquely define the magnetization configuration surrounding the Bloch point. A saturating magnetic field nucleates head-to-head or tail-to-tail domain configurations at the chirality interface, producing a Bloch-point domain wall with deterministic polarity, circulation, and helicity. This geometrical approach enables full three-dimensional control of Bloch point domain walls, allowing deterministic engineering of their spin texture and its selective coupling to current-induced Oersted fields.
Authors
- Amalio Fernández‐Pacheco (ORCID: https://orcid.org/0000-0002-3862-8472)
- Rachid Belkhou (ORCID: https://orcid.org/0000-0002-2218-7481)
- John Fullerton (ORCID: https://orcid.org/0000-0002-7527-7034)
- Claas Abert (ORCID: https://orcid.org/0000-0002-4999-0311)
- Andrea Sorrentino (ORCID: https://orcid.org/0000-0002-3235-8950)
- Dieter Suess (ORCID: https://orcid.org/0000-0001-5453-9974)
- Claire Donnelly (ORCID: https://orcid.org/0000-0002-9942-2419)
- Lucía Aballe (ORCID: https://orcid.org/0000-0003-1810-8768)
- Daniel Wolf (ORCID: https://orcid.org/0000-0001-5000-8578)
- Peter Fischer (ORCID: https://orcid.org/0000-0002-9824-9343)
- Axel Lubk (ORCID: https://orcid.org/0000-0003-2698-8806)
- Eva Pereiro (ORCID: https://orcid.org/0000-0001-7626-5935)
- Naëmi Leo (ORCID: https://orcid.org/0000-0002-0828-6889)
- O. Zaiets (ORCID: https://orcid.org/0000-0003-3060-3112)
- Dédalo Sanz‐Hernández (ORCID: https://orcid.org/0000-0002-5552-8836)
- Takeaki Gokita (ORCID: https://orcid.org/0009-0001-5149-4050)
- Alicia Estela Herguedas Alonso
- Aurelio Hierro‐Rodriguez
- Jakub Jurczyk
Institutions
- Argonne National Laboratory (US)
- University of Vienna (AT)
- Loughborough University (GB)
- TU Wien (AT)
- Lawrence Berkeley National Laboratory (US)
- Universidad de Oviedo (ES)
- University of California, Santa Cruz (US)
- Synchrotron soleil (FR)
- ALBA Synchrotron (Spain) (ES)
- Leibniz Institute for Solid State and Materials Research (DE)
- Max Planck Institute for Chemical Physics of Solids (DE)
- Technische Universität Dresden (DE)
Publication Details
- Journal
- ACS Nano
- Published
- 2026-10-13
- DOI
- https://doi.org/10.1021/acsnano.6c09658
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Materials Sciences and Engineering Division
- U.S. Department of Energy
- Gobierno del Principado de Asturias
- UK Research and Innovation
- Ministerio de Ciencia, Innovación y Universidades
- Austrian Science Fund
- Technische Universität Dresden
- Universität Wien
- Technische Universität Wien
- Centre National de la Recherche Scientifique
- Universidad de Oviedo
- Universidad de Zaragoza
- Office of Science
- Leibniz-Gemeinschaft
- European Regional Development Fund
- Agencia Estatal de Investigación
- Division of Materials Research
- Basic Energy Sciences
- Argonne National Laboratory
- Lawrence Berkeley National Laboratory