Current-induced skyrmion generation and dynamics in symmetric bilayers.
Current-induced skyrmion generation and dynamics in symmetric bilayers.
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DOI：
10.1038/ncomms15765
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发表时间：
2017-06-08
影响因子：
16.6
通讯作者：
Rohart S
中科院分区：
文献类型：
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作者：
Hrabec A;Sampaio J;Belmeguenai M;Gross I;Weil R;Chérif SM;Stashkevich A;Jacques V;Thiaville A;Rohart S
磁性Skyrmions是一种准粒子结构，在拓扑上与其他状态不同。他们在具有破缺反转对称性的系统中的发现，引发了在室温下寻找含有这种磁相的材料。它们的拓扑性质与手性相关的自旋轨道力矩相结合，使它们成为在纳米尺度上控制磁化强度的有趣对象。通过结合Dzyaloshinskii-Moriya相互作用(DMI)和偶极耦合效应，我们证明了在对称磁性双层系统中可以稳定一对手性相反的耦合Skyrmions。这为以较低的DMI稳定Skyrmion开辟了一条道路。我们在一个具有不对称电极的装置中演示了这样的天子可以被大速度的电流独立写入和移位。回旋力证实了观测到的准粒子的天光性质。这些结果为新兴的自旋电子技术奠定了基础，在这些技术中，关于天空子稳定性、成核和传播的问题是至关重要的。基于磁天微子的实用设备的创造依赖于创造和控制稳定的单个天微子的方法的发展。在这里，作者提出了一种双层器件，它利用偶极相互作用来稳定可以通过电流操纵的天米子。
Magnetic skyrmions are quasiparticle-like textures which are topologically different from other states. Their discovery in systems with broken inversion symmetry sparked the search for materials containing such magnetic phase at room temperature. Their topological properties combined with the chirality-related spin–orbit torques make them interesting objects to control the magnetization at nanoscale. Here we show that a pair of coupled skyrmions of opposite chiralities can be stabilized in a symmetric magnetic bilayer system by combining Dzyaloshinskii–Moriya interaction (DMI) and dipolar coupling effects. This opens a path for skyrmion stabilization with lower DMI. We demonstrate in a device with asymmetric electrodes that such skyrmions can be independently written and shifted by electric current at large velocities. The skyrmionic nature of the observed quasiparticles is confirmed by the gyrotropic force. These results set the ground for emerging spintronic technologies where issues concerning skyrmion stability, nucleation and propagation are paramount. The creation of practical devices based on magnetic skyrmions depends on the development of methods to create and control stable individual skyrmions. Here, the authors present a bilayer device that uses dipolar interactions to stabilize skyrmions that can be manipulated using electric currents.