[16a-D419-1~11] 10.2 スピン基盤技術・萌芽的デバイス技術

▲ [16a-D419-10] Control of distribution and motion of skyrmions by sloped electric field

〇Ryo Ishikawa¹、Minori Goto^2,3,4、Hikaru Nomura^2,3,4、Yoshishige Suzuki^2,3,4 (1.ULVAC, Inc.、2.Osaka Univ.、3.CSRN Osaka Univ.、4.OTRI Osaka Univ.)

キーワード：Skyrmion, VCMA

Magnetic Skyrmion is one of the candidates for novel information carrier in spintronics applications such as magnetic racetrack memories and logics [1,2]. Unlike conventional electric devices, utilize of Brownian-motion of Skyrmions for computation is also proposed and confirmed in Ta/CoFeB/Ta junction at room-temperature [3]. Brownian motion of skyrmions can potentially realize unconventional computing such as stochastic calculations and ultra-low power computing. We previously reported fundamental operation of Brownian circuit [4], skyrmion cellular automaton [5] and the device controlling distribution of skyrmion by externally applied voltage [6] in continuous magnetic film. In such a computational device using skyrmions, the application of voltage is a promising method to control the skyrmion. In this work, we investigated the influence of sloped electric field directed to perpendicular to film stack to magnetic domain structure and distribution and motion of skyrmions in Ta/CoFeB/Ta junctions.[1] A. Fert et al., Nat. Nanotechnol. 8, 152 (2013) [2] X. Zhang et al., Sci. Rep. 5, 9400 (2015)
[3] J. Zázvorka et al., Nat. Nanotechnol. 14, 658 (2019) [4] Y. Jibiki, R.I. et al., Appl. Phys. Lett. 117, 082402 (2020)
[5] R. Ishikawa et al., Appl. Phys. Lett. 119, 072402 (2021) [6] R. Ishikawa et al., Appl. Phys. Lett. 121, 252402 (2022)