Generation of Bloch Points with Controlled Spin Texture Using Geometrical Boundary Conditions
14 affiliations
- 1Department of Physics, Loughborough University, Loughborough LE11 3TU, UK
- 2Institute of Applied Physics, TU Wien, Vienna 1040, Austria
- 3Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, Dresden 01069, Germany
- 4Departamento de Física, Universidad de Oviedo, Oviedo 33007, Spain
- 5CINN (CSICUniversidad de Oviedo), El Entrego 33940, Spain
- 6ALBA Synchrotron Light Source, Cerdanyola del Valles, Barcelona 08290, Spain
- 7Institute of Solid State and Materials Physics, Technische Universität Dresden, Dresden 01069, Germany
- 8Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439 United States
- 9Laboratoire Albert Fert, CNRS, Thales, Palaiseau 91767, France
- 10Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
- 11Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- 12Physics Department, University of California Santa Cruz, Santa Cruz, California 95064, United States
- 13Synchrotron SOLEIL, Saint-Aubin 91190, France
- 14Faculty of Physics, University of Vienna, Vienna 1090, Austria
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.
Versions
Related
- Boundary-induced geometrical frustration in a square Rydberg-atom lattice
- Chirally pinned flat bands, helical minibands, and bias-controlled topology of Jackiw-Rebbi states in a periodically modulated Dirac mass texture
- Boundary Conditions and Entanglement in Anti-de Sitter Space
- The Arrow of Records: Structured Boundary Conditions, Receptive Capacity, and Why History Accumulates Toward the Future
- Reducing boundary conditions for the Thomas–Fermi equation using a hybrid q-deformation and neural network method
BibTeX
@article{leo2026generation,
title = {{Generation of Bloch Points with Controlled Spin Texture Using Geometrical Boundary Conditions}},
author = {Naëmi Leo and Daniel Wolf and Alicia Estela Herguedas-Alonso and Oleksandr Zaiets and Jakub Jurczyk and Takeaki Gokita and John Fullerton and Dedalo Sanz-Hernandez and Claire Donnelly and Andrea Sorrentino and Eva Pereiro and Lucia Aballe and Peter Fischer and Rachid Belkhou and Claas Abert and Dieter Suess and Axel Lubk and Aurelio Hierro-Rodriguez and Amalio Fernández-Pacheco},
journal = {ACS Nano},
year = {2026},
month = oct,
doi = {10.1021/acsnano.6c09658},
url = {https://doi.org/10.1021/acsnano.6c09658},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Generation of Bloch Points with Controlled Spin Texture Using Geometrical Boundary Conditions
AU - Naëmi Leo
AU - Daniel Wolf
AU - Alicia Estela Herguedas-Alonso
AU - Oleksandr Zaiets
AU - Jakub Jurczyk
AU - Takeaki Gokita
AU - John Fullerton
AU - Dedalo Sanz-Hernandez
AU - Claire Donnelly
AU - Andrea Sorrentino
AU - Eva Pereiro
AU - Lucia Aballe
AU - Peter Fischer
AU - Rachid Belkhou
AU - Claas Abert
AU - Dieter Suess
AU - Axel Lubk
AU - Aurelio Hierro-Rodriguez
AU - Amalio Fernández-Pacheco
PY - 2026
DA - 2026/10/13
JO - ACS Nano
DO - 10.1021/acsnano.6c09658
UR - https://doi.org/10.1021/acsnano.6c09658
AB - 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.
SN - 1936-0851
SN - 1936-086X
ER -