Dramatic influence of curvature of nanowire on chiral domain wall velocity.
Dramatic influence of curvature of nanowire on chiral domain wall velocity.
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DOI：
10.1126/sciadv.1602804
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发表时间：
2017-05
期刊：
影响因子：
13.6
通讯作者：
Parkin SSP
中科院分区：
文献类型：
--
作者：
Garg C;Yang SH;Phung T;Pushp A;Parkin SSP
由手性自旋轨道力矩驱动的畴壁的速度在右手弯曲附近比左手弯曲快10倍。利用电流脉冲沿着奈米线移动电畴壁，是过去十年自旋电子学最令人兴奋的发展之一。我们发现，改变纳米线的曲率的符号的变化的速度手性Néel域壁垂直磁化纳米线的一个因素的10。畴壁在给定曲率的导线中具有增大或减小的速度，这与畴壁的手征性和电流引起的自旋轨道转矩的符号无关。因此，相邻的畴壁以不同的速度移动。对于畴壁沿着弯曲纳米线的稳定运动，扭矩必须随半径线性增加，从而导致畴壁的宽度依赖性倾斜。我们表明，通过使用合成的反铁磁纳米线，曲率对畴壁的速度的影响被消除，所有的畴壁一起移动，强调使用这种结构的自旋电子学应用。
The velocity of domain walls driven by chiral spin-orbit torques is up to 10 times faster around right- than left-handed bends. The use of current pulses to move domain walls along nanowires is one of the most exciting developments in spintronics over the past decade. We show that changing the sign of the curvature of a nanowire changes the speed of chiral Néel domain walls in perpendicularly magnetized nanowires by up to a factor of 10. The domain walls have an increased or decreased velocity in wires of a given curvature, independent of the domain wall chirality and the sign of the current-induced spin-orbit torques. Thus, adjacent domain walls move at different speeds. For steady motion of domain walls along the curved nanowire, the torque must increase linearly with the radius, which thereby results in a width-dependent tilting of the domain wall. We show that by using synthetic antiferromagnetic nanowires, the influence of the curvature on the domain wall’s velocity is eliminated, and all domain walls move together, emphasizing the use of such structures for spintronic applications.