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Magnetic nano-vortex: Swirling boundaries

Magnetic nano-vortex: Swirling boundaries

Magnetic nano-vortex: Swirling boundaries
Feb 24, 2020 1 min, 12 secs

This reveals a variety of dynamics inside the material, including the motion of swirling boundaries between different magnetic domains.

Now, for the first time, PSI researchers were able to record a short "film" of the three-dimensional magnetic structure inside a material with nanoscale resolution.

"Magnetism plays a role in many ways in our everyday lives; but at this very small, fundamental level, the phenomena are not yet fully understood," explains Claire Donnelly, lead author of the study.

The sample they examined consisted of a gadolinium-cobalt compound patterned into a circular disc.

More than four days for seven images

"With our method we can non-destructively scan the material and from the data reconstruct several successive 3D images of the inner magnetic structure," says PSI researcher Manuel Guizar-Sicairos.

In these we can see how a domain boundary moves back and forth." It took the scientists a little more than four days of constant measuring to collect the data, which later yielded this sequence of seven images.

Like stroboscopic light

The observed movement of the domain boundary was repeatedly and specifically induced by the researchers themselves through an externally applied magnetic field.

Instead, the scientists created a time loop of the changing magnetic field and took images at different points in time within it- similar to stroboscopic light seemingly slowing down a repetitive movement.

The recording of the 3D images from inside the sample in turn draws on a basic principle from computed tomography (CT).

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