Current-controlled propagation of spin waves in antiparallel, coupled domains
Current-controlled propagation of spin waves in antiparallel, coupled domains
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DOI：
10.1038/s41565-019-0429-7
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发表时间：
2019-07-01
影响因子：
38.3
通讯作者：
Yu, Haiming
中科院分区：
文献类型：
--
作者：
Liu, Chuanpu;Wu, Shizhe;Yu, Haiming
自旋波可能构成低功率自旋电子器件的关键组件。反铁磁型自旋波是天生的高速、稳定和双极化的。到目前为止，激发和操纵反铁磁型传播的自旋波仍然具有挑战性。在这里，我们研究了La0.67Sr0.33MnO_3薄膜中具有上下交替磁化强度的100 nm宽的周期性条形磁畴中的自旋波。除了普通的低频模式外，还观察到了一个10 GHz左右的高频模式，并沿着条形区域传播，其自旋波色散不同于低频模式。基于考虑两个相反方向的耦合磁区的理论模型，该高频模式被解释为一种有效的反铁磁自旋波模式。自旋波的群速度为2.6kM S(-1)，并且即使在零偏磁场下也能传播。密度仅为10(5)A cm(-2)的电流脉冲可以可控地改变条形磁畴的取向，为可重构磁子器件开辟了新的前景。
Spin waves may constitute key components of low-power spintronic devices. Antiferromagnetic-type spin waves are innately high-speed, stable and dual-polarized. So far, it has remained challenging to excite and manipulate antiferromagnetic-type propagating spin waves. Here, we investigate spin waves in periodic 100-nm-wide stripe domains with alternating upward and downward magnetization in La0.67Sr0.33MnO3 thin films. In addition to ordinary low-frequency modes, a high-frequency mode around 10 GHz is observed and propagates along the stripe domains with a spin-wave dispersion different from the low-frequency mode. Based on a theoretical model that considers two oppositely oriented coupled domains, this high-frequency mode is accounted for as an effective antiferromagnetic spin-wave mode. The spin waves exhibit group velocities of 2.6 km s(-1) and propagate even at zero magnetic bias field. An electric current pulse with a density of only 10(5) A cm(-2) can controllably modify the orientation of the stripe domains, which opens up perspectives for reconfigurable magnonic devices.