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A magnetic vortex is like a tiny whirlpool in the sea, except that instead of water, it's magnetization that swirls. Such vortices could become memory cells in future computers, but to write and read information, you need to be able to move each vortex individually. So far, this is done crudely — shifting a whole bunch at once.

Scientists propose to catch vortices with sound. A sound wave is a wave of compressions and rarefactions, like ripples on water. If you direct two such waves at each other at right angles, at their intersection a point arises where vibrations are especially strong. The magnetic vortex is attracted there, like a dust particle to a charged comb. By moving the waves, you can smoothly drag the vortex across the chip.

The force that pulls the vortex arises because sound slightly changes the magnetic properties of the material. The vortex goes where it is energetically favorable — to the point of strong vibrations. This is like a ball rolling into a dimple on a table. This method does not break the vortex and does not require complex electrical contacts nearby.

Original abstract

as written by the authors arXiv:2608.13055v1

Current methods for driving magnetic skyrmions predominantly translate ensembles as a whole, lacking single-particle selectivity. Here, we propose an "acoustic tweezer" that deterministically traps and routes individual skyrmions using spatially extended acoustic beams. We reveal that spatially confined longitudinal waves carry nontrivial phonon spin, inducing a magnetoelastic field whose chirality is locked to the acoustic spin texture. This generates polarity-selective radiation forces, distinct from conservative gradient forces, that attract skyrmions to local phonon spin maxima. Intersecting orthogonal beams create reconfigurable attractive points for adiabatic, deterministic manipulation. Our global-field-local-interaction paradigm establishes a non-destructive, on-chip route for high-precision topological spintronics.