[23a-A205-1~13] 10.2 Fundamental and exploratory device technologies for spin

▼ [23a-A205-5] Evaluation of stochastic process of skyrmion using transfer entropy

〇(M2)Hiroki Mori¹, Minori Goto^1,2, Ryo Ishikawa³, Soma Miki¹, Hikaru Nomura^1,2, Yoshishige Suzuki^1,2 (1.Osaka Univ., 2.CSRN-Osaka, 3.ULVAC, Inc.)

Keywords:skyrmion, transfer entropy, non-Markov system

Recently, extensive research has been conducted on computational devices that utilize the randomness or probabilistic properties in systems, such as Brownian computing and probabilistic bits devices. In these systems, stochastic process has an important role to reveal information propagation. One of systems in which stochastic behavior can be observed in solids at ambient temperature is skyrmion system. Skyrmion has a topologically stable spin structure and can be expected to propagate information through a repulsive interaction between skyrmions. However, the stochastic process in such system have not been fully investigated. Here, we focus on conditional Shannon entropy (CSE) and transfer entropy (TE), which can be calculated from conditional probabilities. This study evaluates TE from the Brownian motion of two skyrmions confined in a square cell and investigates the stochastic process in this system.