Ultrafast and reliable domain-wall and skyrmion logic in a chirally coupled ferrimagnet

TL;DR

This paper demonstrates ultrafast, reliable spin-based logic using chiral spin textures in ferrimagnets, achieving high-speed operations with potential for next-generation low-power computing.

Contribution

It introduces a novel approach leveraging Dzyaloshinskii-Moriya interaction-induced chiral coupling for ultrafast, reliable spin logic with skyrmions and domain-walls.

Findings

Domain-wall motion exceeds 1 km/s

Logic operation time is 50 ps for 50 nm gate

Skyrmion-based computation is topologically protected

Abstract

Unlocking the spin degree of freedom in addition to the electron's charge, spin-based logic offers an in-memory computing architecture beyond-CMOS technology. Here, we encode information into chiral spin textures (e.g., chiral domain-wall and skyrmion) and achieve an ultrafast and reliable all-electrical logic by exploiting the Dzyaloshinskii-Moriya interaction-induced chiral coupling. Taking advantage of fast spin dynamics in antiferromagnetically coupled systems, we achieved a fast domain-wall motion passing through the logic gate, exceeding 1 kilometre per second, yielding an operation time of 50 picoseconds for a 50 nanometres-long logic gate. Furthermore, we present a fast logic operation with skyrmion bubbles in a racetrack that exhibits a topologically protected computation scheme. Our work demonstrates a viable approach for advanced microchips with high operation frequency and ultralow power consumption, paving the way for next-generation computing technologies.