Dipole chains of Bloch point singularities revealed by X-ray magnetic tomography
Jeffrey Neethirajan, Rikako Yamamoto, Marisel Di Pietro Martínez, Luke A. Turnbull, Praveen Vir, Chandra Shekar et al. · arXiv: 2610.31952v1 · Summary page
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Magnetic singularities form a chain
Bloch points are singularities in a magnetic texture, places where the surrounding magnetization cannot be described as a smoothly continuous direction field. Using soft X-ray magnetic vector tomography, researchers have observed a dipole chain of these defects in an anisotropic chiral magnet. Previously, such points had been observed as isolated objects or within individual topological textures.
The chain followed a boundary between regions of opposite chirality. Its stability depended on the surrounding magnetic topology, and the researchers identified a separation threshold for spontaneous annihilation of paired defects within chiral domain walls. The result moves the discussion from individual singularities toward arrangements whose members may influence one another—a step toward understanding and controlling more elaborate magnetic structures, rather than evidence that such structures already function as devices.
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