National Creative Research Initiative Center for Spin Dynamics & Spin-Wave Devices, Nanospinics Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea.
Phys Rev Lett. 2011 Apr 8;106(14):147201. doi: 10.1103/PhysRevLett.106.147201. Epub 2011 Apr 4.
We report an additional reversal mechanism of magnetic vortex cores in nanodot elements driven by currents flowing perpendicular to the sample plane, occurring via dynamic transformations between two coupled edge solitons and bulk vortex solitons. This mechanism differs completely from the well-known switching process mediated by the creation and annihilation of vortex-antivortex pairs in terms of the associated topological solitons, energies, and spin-wave emissions. Strongly localized out-of-plane gyrotropic fields induced by the fast motion of the coupled edge solitons enable a magnetization dip that plays a crucial role in the formation of the reversed core magnetization. This work provides a deeper physical insight into the dynamic transformations of magnetic topological solitons in nanoelements.
我们报告了一种在垂直于样品平面的电流驱动下纳米点元件中磁涡旋核的附加反转机制，该机制通过两个耦合的边缘孤子和体涡旋孤子之间的动态转变发生。与通过产生和湮灭涡旋-反涡旋对介导的著名开关过程相比，该机制在相关拓扑孤子、能量和自旋波发射方面完全不同。由耦合边缘孤子的快速运动引起的强烈局域的非平面各向异性场使磁化强度发生倾斜，这在反转核心磁化的形成中起着关键作用。这项工作为纳米元件中磁拓扑孤子的动态转变提供了更深入的物理理解。
