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3D Imaging of Complex Skyrmion and Hopf Topologies in an Extended Sample

I. Binnie, H. Fang

Featured June 29, 2026

Original Paper

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Simply

Scientists developed a new X-ray camera and smart computer programs to take 3D pictures of tiny magnetic swirls, called skyrmions, inside thin films, showing how they twist and turn from top to bottom, just like a tiny, invisible magnetic tornado.

In depth
The paper introduces a novel approach for directly imaging the 3D magnetic texture of complex spin structures like skyrmions and hopfions in extended thin-film samples. By combining vector ptycho-tomography with noise-robust algorithms, the authors overcome limitations of prior methods that required structured samples or relied on physical assumptions, enabling high-resolution, element-specific 3D reconstructions without prior knowledge of the sample's magnetic properties. This allows for the direct measurement of depth-dependent features such as twisted helicity and fractional Hopf index.

Key Takeaways

  • 1
    The study demonstrates the first direct, 3D full-field imaging of skyrmion lattices in extended thin films, revealing their complex depth-dependent magnetic structures.
  • 2
    A vector ptycho-tomography technique, enhanced with noise-robust algorithms and fiducial marks, enables high-resolution (8 nm) reconstruction without prior sample assumptions.
  • 3
    The method quantitatively extracts depth-resolved topological properties like domain wall width, twisted helicity, and fractional Hopf index, confirming theoretical predictions for dipole-stabilized skyrmions.

Conceptual Flow

HIGH LEVEL
1
Seeing Tiny Magnetic Twists in 3D

They shine special X-rays through a thin magnetic film from many angles, then use smart computer programs to build a full 3D picture of the tiny magnetic swirls inside.

X-ray Beam
Spinning Sample
Capture Shadows
Many 2D Pictures
Build 3D Map
2
Unveiling Hidden Magnetic Shapes

The 3D pictures showed that the magnetic swirls are not simple cylinders but twist like barrels, changing their magnetic direction from the surface to the inside.

Simple Magnetic Swirl Idea
New 3D Magnetic Map
Compare Shapes
Twisted Barrel Swirls
Surface to Core Change