SKY · PSĒPHOS · the knot that won't untie

SKYRMIONIC CORE

The bit is usually a charge you trap or a voltage you hold. Here the bit is a skyrmion — a tiny knot of spin in a magnetic film, a whirl that is topologically protected: you cannot smooth it away without tearing the field. It is moved by a whisper of current, it dodges defects, and it stores a 1 just by being there. Compute by moving knots.

▶ THE RACETRACK · skyrmions driven by current

A live racetrack-memory lane. Each swirl is a skyrmion = one bit. Current pushes them along the track, but a real twist comes free: the topological charge gives a sideways Magnus force (the skyrmion-Hall effect), so they ride against one rail — the edge confines them. Inject bits, clock the current, watch them repel each other (the basis of an AND gate) and shift down the line.

drive on track 0 read out 0 Hall θ —

The sideways drift is the genuine signature physics — unlike a domain wall, a skyrmion moves at an angle to the push (Thiele equation, the gyrocoupling term). It is also why they are robust: the same Magnus force lets them curve around pinning defects instead of getting stuck. Real dynamics, schematic scale. The chip is the concept; the knot is real.