A. Jenkins

In a tiny magnetic dot, smaller than a micron, lives a vortex — magnetization swirls like water in a drain. At the center of this swirl is a core that itself orbits in a small circle, like a spinning top that's been given a nudge.

A radio receiver picks up only one station because its resonant circuit is tuned to that station's frequency. Magnetic vortices in a new type of computing element work in much the same way.