[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-E216-5] Domain wall propagation by spin-orbit torques in in-plane magnetized systems

〇Ryuhei Kohno^1,2,3,4、Joao Sampaio^1,2,3,4、Stanislas Rohart^1,2,3,4、Andre Thiaville^1,2,3,4 (1.LPS、2.CNRS、3.Univ. Paris-Sud、4.Univ. Paris-Saclay)

キーワード：domain wall motion, micromagnetic simulation, spin orbit torque

The effect of damping-like spin-orbit torque (DL SOT) on in-plane domain walls (DWs) in tracks was studied by micromagnetic simulations and analytically. We find that DL SOT can drive vortex DWs (VDWs) more efficiently than spin-transfer torque (STT) in a comparable system, whereas transverse DWs (TDWs), the other typical DW structure in soft tracks, are not driven in the absence of Dzyaloshinskii-Moriya interaction (DMI). Our analysis based on the Thiele equation shows that the driving force for the VDW is associated with a distortion from the perfect vortex due to geometrical confinement. This distortion is higher, and the SOT DW driving is more efficient, in narrower, thinner tracks. Interestingly, in the presence of the DMI, it enhances the distortion of both VDWs and TDW, and it produces the driving force for TDWs. We show also that it is possible to determine the relative amplitudes of STT and DL SOT by comparing the motion of different vortex DW structures in the same track.