[14p-PA1-1~74] 10 スピントロニクス・マグネティクス

[14p-PA1-50] Nonequilibrium long-range accumulations of skyrmions at Pt/Co interfaces

〇杉本 聡志¹、高橋 有紀子¹、葛西 伸哉^1,2 (1.物材機構、2.さきがけ)

キーワード：スカーミオン、ジャロシンスキー守谷相互作用、垂直磁化膜

Magnetic skyrmions are topological defects in magnetization mostly induced by the chiral interaction. We report observations of different types of current-induced dynamics which show thermodynamic concepts beyond the scope of ongoing particle nature. We've investigated current-induced dynamics at room-temperature for (i) W/CoFeB/MgO and (ii) Pt/Co/Ir interfaces, respectively. For (i) W/CoFeB/MgO interfaces, skyrmion’s trajectories can be described by the Thiele equation with spin-orbit torque terms. On the contrary, dynamics at (ii) Pt/Co/Ir interfaces show accumulative phenomena along the Hall direction prior to threshold current for longitudinal driving. Such long-range accumation can be interpreted by introducing thermodynamic concept, and provides a new methodologies of handling distributions of skyrmions over several tens of micrometers only by switching local currents.