Researchers create exotic magnetic structures using laser light

Researchers create exotic magnetic structures using laser light

Credit: Claudio Verduzi

Research at Lund University in Sweden has found a new way to create nano-sized magnetic particles using ultrafast laser light pulses. This discovery could pave the way for new, more energy-efficient technical components and become useful in quantum computers of the future.

Magnetic celestial bodies are sometimes described as magnetic vortices. Unlike ferromagnetic states – which occur in traditional magnets such as compasses and refrigerator magnets – skyrmion The case is quite peculiar: the direction of magnetization does not point in the same direction everywhere in the material, but is best described as a type of vortex magnetism.

Skyrmions are of great interest to both basic research and industry, as they can be used to fabricate more embedded computer memories. However, that is easier said than done. Using skyrmions for technical purposes requires efficient methods for writing, scanning, and manipulating particles on short time scales and with high spatial resolution.

In a new study published in npj math materialResearchers Claudio Verduzi of Lund University and Emil Finnas-Bostrom and Angel Rubio of the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg have found a new approach.

“In our study, we theoretically demonstrated how one of these requirements could be met, i.e. how to create magnetic skyrmions on extremely short time scales using pulses of laser light,” says Claudio Verduzi, a physics researcher at Lund University.

The research team identified a microscopic mechanism that explains an experimental protocol that has been shown to be useful in creating alien skies. Using femtosecond laser pulses –light pulses In the last millionth of a billionth of a second – researchers have shown that it is possible to create skyrming at breakneck speed.

“Our results are very relevant for creating more energy efficient technology components. Our study shows that light can be used to manipulate magnetic excitation On very short time scales,” says Claudio Verduzi.

There are a number of applications that the new discovery could lead to, including quantum technology – an area where quantum mechanical properties They are used to solve highly advanced arithmetic operations that conventional computers cannot handle. It is also believed that magnetic excitations such as sky heights and so-called spin waves are able to help reduce them Energy consumption in technological components, and thus could help achieve future climate goals.

Claudio Verduzzi concludes, “Skyrmions are in the focus of both theoretical and experimental research thanks to their technological capabilities. Their peculiar magnetic patterns also have a conceptual and mathematical appeal that makes them very interesting.”

A definitively integrated manipulation of the magnetic sky has been achieved in a nanostructured device

more information:
Emil Viñas Boström et al, Microscopic theory of light-induced ultrafast sky excitation in transition metal films, npj math material (2022). DOI: 10.1038 / s41524-022-00735-5

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