Reservoir Computing with Spin Waves in Skyrmion Crystal

TL;DR

This paper introduces a novel reservoir computing approach using spin waves in skyrmion crystals, demonstrating their potential for efficient, non-fabricated spintronic information processing with promising experimental results.

Contribution

It proposes a new skyrmion-based reservoir computing system utilizing natural spin-wave dynamics, avoiding complex nanofabrication, and demonstrates its effectiveness through standard computational tasks.

Findings

The skyrmion spin-wave reservoir exhibits nonlinearity and short-term memory.

It performs well on duration-estimation, short-term memory, and parity-check tasks.

Magnetic skyrmion crystals are promising for spintronics reservoir devices.

Abstract

Magnetic skyrmions are nanometric spin textures characterized by a quantized topological invariant in magnets and often emerge in a crystallized form called skyrmion crystal in an external magnetic field. We propose that magnets hosting a skyrmion crystal possess high potential for application to reservoir computing, which is one of the most successful information processing techniques inspired by functions of human brains. Our skyrmion-based reservoir exploits precession dynamics of magnetizations, i.e., spin waves, propagating in the skyrmion crystal. Because of complex interferences and slow relaxations of the spin-wave dynamics, the skyrmion spin-wave reservoir attains several important characteristics required for reservoir computing, e.g., the generalization ability, the nonlinearity, and the short-term memory. We investigate these properties by imposing three standard tasks to test the performances of reservoir, i.e., the duration-estimation task, the short-term memory task, and the parity-check task. Through these investigations, we demonstrate that magnetic skyrmion crystals are promising materials for spintronics reservoir devices. Because magnetic skyrmions emerge spontaneously in magnets via self-organization process under application of a static magnetic field, the proposed skyrmion reservoir requires neither advanced nanofabrication nor complicated manufacturing for production in contrast to other previously proposed magnetic reservoirs constructed with fabricated spintronics devices. Our proposal is expected to realize a breakthrough in the research of spintronics reservoirs of high performance.