[21a-P02-1~50] 10 スピントロニクス・マグネティクス(ポスター)

[21a-P02-33] Observation of Self-Induced Spin-Orbit Torque via Vertical Composition Gradient

〇日比野 有岐¹、谷口 知大¹、田丸 慎吾¹、薬師寺 啓¹、久保田 均¹、湯浅 新治¹ (1.産総研)

キーワード：磁性多層膜、スピンホール効果、スピン軌道トルク

Spin-orbit coupling in ferromagnet can generate spin current via charge-to-spin conversion such as spin Hall effect. This spin current induces spin-orbit torques (SOTs) acting on magnetization of ferromagnet itself which is called self-induced SOTs. Self-induced SOTs can be new routes for realizing energy-efficient SOT-based devices. To generate finite self-induced SOT, inversion symmetry in FMs needs to be broken. Here, we show that a vertical composition gradient in ferromagnet can be an effective way to introduce inversion asymmetry and generate large self-induced SOT.