Light With Skyrmion Structure Steers Magnetic Skyrmions in New Simulations

In a result that could reshape how scientists think about the boundary between light and magnetism, researchers in Japan have shown through detailed computer simulations that structured beams of light carrying skyrmion-like patterns can be used to steer the motion of magnetic skyrmions, the tiny whirling textures of magnetization that many consider leading candidates for future information technologies. The study, led by Professor Masahito Mochizuki of the Department of Applied Physics at Waseda University and Dr. Lan Bo, a Japan Society for the Promotion of Science postdoctoral fellow at the same institution, was published online in the journal Physical Review Letters on September 14, 2026, with contributions from former Waseda research associate professor Dr. Xichao Zhang and collaborators in China and Singapore.

Magnetic skyrmions, often abbreviated as MSks, are nanoscale swirls of magnetization that form inside certain magnetic materials. What makes them remarkable is that, despite being patterns rather than particles, they behave in many ways like real objects: they possess a stable internal structure, well-defined boundaries, and a topological character that protects them from easily being destroyed. Because they are extraordinarily small and can be displaced with comparatively little energy, MSks have attracted intense interest as information carriers in next-generation memory devices and logic circuits, where data might one day be written and read by shuttling these magnetic vortices across a chip. The central obstacle has been control. Moving skyrmions reliably, precisely, and without unwanted side effects remains one of the field’s most stubborn engineering challenges.

The Waseda-led team approached this challenge from an unexpected direction. In recent years, physicists working in photonics have discovered that light itself can be sculpted into topological structures known as optical skyrmions, or OSks. These are intricate textures in the polarization and phase of electromagnetic fields that obey the same topological description as their magnetic counterparts, even though one lives in matter and the other in a propagating field. Until now, the two families of skyrmions had largely been studied in parallel, within the separate communities of magnetism and photonics. The Japanese team asked a deceptively simple question: if the mathematics is shared, could the topology of light actually command the dynamics of a magnetic texture?

Dr. Bo described the intellectual spark behind the project in terms of that very encounter. The inspiration, he explained, came from asking what happens when two different forms of topology, one in matter and one in light, meet. What fascinated the team, he noted, is that magnetic skyrmions and optical skyrmions are physically very different, since one exists in a magnetic material and the other in an electromagnetic field, yet they are described by essentially the same topological concept. That shared description led the researchers to ask whether the topology and internal structure of light could directly control the dynamics of a topological magnetic texture.

To find out, the team turned to micromagnetic simulations, a computational technique that models the evolution of magnetization in magnetic materials under applied influences. In their virtual experiment, a single magnetic skyrmion sat on a thin magnetic layer, and an optical skyrmion beam was directed at it. The beam was constructed from two types of structured light called Laguerre-Gaussian modes, whose combined phase and polarization properties give rise to a skyrmion-like polarization pattern in the optical field. The researchers then simulated how this structured optical field would drive the motion of the magnetic skyrmion, using equations that describe both the effect of light on magnetization and the internal dynamics of the magnetic material itself.

The simulations revealed something striking: rather than a single generic response, the magnetic skyrmion exhibited three distinct types of motion depending on the properties of the light. In the first type, the skyrmion executed a rotational motion around a fixed orbit, with the radius of that orbit set by the intensity gradient of the light beam. In the second type, the skyrmion deviated locally from its orbit in a behavior the researchers described as skipping, briefly leaving its circular path before returning. The third type was a looping trajectory known as trochoidal motion, in which the skyrmion traced a pattern reminiscent of a point on a rolling wheel, combining rotation with translation in a characteristic cycloidal dance.

Crucially, the team was able to trace each of these behaviors back to specific, tunable properties of the incident light field. Most notably, the direction of the skipping motion was governed by the swirling direction, or helicity, of the vector field within the optical skyrmion, as well as by the chirality, or handedness, of the magnetic skyrmion itself. In practical terms, this means that adjusting the intensity, phase, and polarization structure of the light offers a set of independent knobs for precisely altering the trajectory of a magnetic skyrmion. The topology of the light does not merely perturb the magnet; it encodes instructions that the magnetic texture appears to follow.

Professor Mochizuki framed the result as the establishment of a new bridge between topological photonics and topological magnetism, opening a route toward contact-free and programmable control of magnetic skyrmions. The phrase contact-free deserves emphasis. Conventional approaches to moving skyrmions typically rely on electric currents, which generate heat, introduce noise, and impose wiring constraints on any future device. An optical scheme, by contrast, could in principle address skyrmions from a distance, with the light beam itself serving as the steering mechanism, and with the rich parameter space of structured light offering a degree of programmability that currents cannot easily match.

The potential applications suggested by the team span several emerging fields. Dr. Bo elaborated that the induced rotational motion could potentially provide a basis for optically trapping and manipulating magnetic skyrmions, analogous to the way optical tweezers hold and move microscopic particles with focused light. The helicity-controlled skipping motion, meanwhile, could enable selective trajectory steering and the conversion of optical information into magnetic motion, effectively allowing patterns written into a light beam to be transcribed into the positions and paths of magnetic vortices. The trochoidal motion may also provide an optically tunable oscillator-like response, hinting at uses in signal generation or frequency control where a magnetic element could be made to oscillate in a way dictated entirely by the structure of the illuminating light.

Taken together, these findings sketch the outlines of a hybrid discipline in which information encoded in the structure of light is translated directly into magnetic motion. Such a capability could underpin future optomagnonic technologies, in which magnetic properties are controlled using light, and spintronic devices, which process and store data using the charge and spin of electrons. As Professor Mochizuki concluded, future information technologies require faster, smaller, and more energy-efficient ways to store and process information, and magnetic skyrmions are attractive candidates for such technologies. By showing how the trajectory of a magnetic skyrmion could be optically controlled, the work reveals a new principle for connecting photonic information processing with spintronic information storage and computation. For now, the demonstration rests on simulation rather than experiment, but it provides a concrete and testable framework, and it suggests that the next generation of skyrmion devices may be guided not by wires and currents but by beams of light whose very shape carries the blueprint of the motion they command.

Subject of Research: Optical control of magnetic skyrmion motion using structured light with skyrmion topology

Article Title: Optical skyrmions can control the motion of magnetic skyrmions

Article References: Optical skyrmions can control the motion of magnetic skyrmions. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: magnetic skyrmions, optical skyrmions, topological photonics, topological magnetism, micromagnetic simulations, spintronics, optomagnonics, structured light, Laguerre-Gaussian modes, Waseda University, Physical Review Letters, information storage