[20p-E216-1~7] 【CS.8】 10.1 新物質・新機能創成（作製・評価技術）、10.2 スピン基盤技術・萌芽的デバイス技術、10.3 スピンデバイス・磁気メモリ・ストレージ技術、10.4 半導体スピントロニクス・超伝導・強相関のコードシェアセッション

▲ [20p-E216-1] Surface Rashba-Edelstein Spin-Orbit Torque tuned by organic monolayer

〇Satoshi Haku¹、Akira Musha¹、Hiroyasu Nakayama²、Kazuya Ando¹ (1.Keio Univ.、2.NIMS)

キーワード：spin-orbit torque, Rashba-Edelstein effect, self-assembled monolayer

We report the observation of the spin-orbit torque (SOT) arising from the surface Rashba-Edelstein (RE) effect of an ultra-thin Pt film by using spin-torque ferromagnetic resonance measurement. The crucial evidence was obtained by molecular tuning of the symmetry-breaking strength of the Pt surface. We found that the damping-like SOT in a Pt/Co bilayer is manipulated by decorating the Pt surface with self-assembled organic monolayers, while the field-like SOT is unaffected by the molecular self-assembly. This result is consistent with the prediction of the SOT arising from the surface RE effect and spin-transfer mechanism. These results therefore illustrate the crucial role of the surface spin-orbit coupling in metallic spin-orbitronic devices, providing a way for molecular tuning of the SOTs.