Dynamics of Magnetic Domain Walls Under Their Own Inertia
Dynamics of Magnetic Domain Walls Under Their Own Inertia
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DOI：
10.1126/science.1197468
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发表时间：
2010-12-23
期刊：
影响因子：
56.9
通讯作者：
Parkin, Stuart S. P.
中科院分区：
文献类型：
--
作者：
Thomas, Luc;Moriya, Rai;Parkin, Stuart S. P.
自旋极化电流引起的磁畴壁运动在磁存储器和逻辑器件中具有巨大的应用潜力。这些设备成功的关键是使用电流脉冲沿磁性纳米线精确定位各个畴壁。我们发现，当电流刺激被移除时，畴壁会在其自身惯性的作用下移动几微米的令人惊讶的长距离，并在数十纳秒内松弛。我们还表明，由于脉冲开始时的加速度产生的滞后，畴壁行进的净距离与当前脉冲长度完全成正比。因此，无论其惯性如何，可以使用适当定时的电流脉冲来精确定位畴壁。
The motion of magnetic domain walls induced by spin-polarized current has considerable potential for use in magnetic memory and logic devices. Key to the success of these devices is the precise positioning of individual domain walls along magnetic nanowires, using current pulses. We show that domain walls move surprisingly long distances of several micrometers and relax over several tens of nanoseconds, under their own inertia, when the current stimulus is removed. We also show that the net distance traveled by the domain wall is exactly proportional to the current pulse length because of the lag derived from its acceleration at the onset of the pulse. Thus, independent of its inertia, a domain wall can be accurately positioned using properly timed current pulses.