Spin Convergence Research Team, Korea Research Institute of Standards and Science, Daejeon, 34113, Republic of Korea.
Center for Spintronics, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea.
Nat Commun. 2018 Sep 17;9(1):3788. doi: 10.1038/s41467-018-06223-z.
Current-induced magnetic domain wall (DW) motion is an important operating principle of spintronic devices. Injected current generates spin torques (STs) on the DWs in two ways. One is the spin transfer from magnetic domains to the walls by the current flowing in the magnet. Current flow in attached heavy metals also generates another ST because of the spin-Hall effect. Both phenomena explain the wall motions well; therefore, their respective contribution is an important issue. Here, we show the simultaneous measurement of both torques by using magnetic facet domains that form mountain-shaped domains with straight walls. When the STs and the external magnetic field push the walls in opposite directions, the walls should have equilibrium angles to create balanced states. Such angles can be modulated by an additional in-plane magnetic field. Angle measurements distinguish the STs because each torque has a distinct mechanism related to the DW structure.
电流诱导磁畴壁（DW）运动是自旋电子器件的重要工作原理。电流以两种方式在 DW 上产生自旋扭矩（ST）。一种是通过流经磁铁的电流将磁畴中的自旋转移到壁上。由于自旋霍尔效应，附着在重金属上的电流也会产生另一种 ST。这两种现象都很好地解释了壁的运动；因此，它们各自的贡献是一个重要的问题。在这里，我们通过使用形成具有直壁的山形畴的磁面畴来同时测量这两种扭矩。当 ST 和外部磁场以相反的方向推动壁时，壁应该具有平衡角度以创建平衡状态。可以通过附加的面内磁场来调制这种角度。角度测量可以区分 ST，因为每个扭矩都有一个与 DW 结构相关的独特机制。
