Brownian computing using magnetic skyrmions

Abstract

Energy consumption associated with the recent artificial intelligence has become more critical. To solve this problem, stochastic computing using room-temperature heat has been proposed and demonstrated in spintronics by tuning a magnetic device and allowing the spins to be susceptible to thermal fluctuations. Magnetic skyrmions, which are spin structures in magnetic thin films, behave as particles and exhibit thermal fluctuations of spins as Brownian motion in solid. This article introduces a “Brownian computer” that requires minimal external energy by the Brownian motion and describes the properties of Brownian motion of magnetic skyrmions and their control.