Iacocca Ezio, Silva T J, Hoefer Mark A
Department of Applied Mathematics, University of Colorado, Boulder, Colorado 80309, USA.
Department of Physics, Division for Theoretical Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden.
Phys Rev B. 2017 Oct;96(13). doi: 10.1103/PhysRevB.96.134434.
Planar ferromagnetic channels have been shown to theoretically support However, realistic materials exhibit in-plane anisotropy, which breaks the axial symmetry assumed in current theoretical models. Here, we study in a ferromagnet with in-plane anisotropy from a dispersive hydrodynamic perspective. Through the analysis of a boundary value problem for a damped sine-Gordon equation, in a ferromagnetic channel can be excited above a spin current threshold that depends on material parameters and the length of the channel. Micromagnetic simulations are used to verify that the analytical results are qualitatively correct, even in the presence of non-local dipole fields. Simulations also confirm that can be driven by spin transfer torque in a finite-sized region. These results delineate the important material parameters that must be optimized for the excitation of in realistic systems.
平面铁磁通道在理论上已被证明能够支持……然而，实际材料表现出平面内各向异性，这打破了当前理论模型中所假设的轴向对称性。在此，我们从色散流体动力学的角度研究具有平面内各向异性的铁磁体中的……通过对一个阻尼正弦 - 戈登方程的边值问题进行分析，铁磁通道中的……可以在一个取决于材料参数和通道长度的自旋电流阈值之上被激发。微磁模拟用于验证即使存在非局部偶极场，分析结果在定性上也是正确的。模拟还证实……可以在有限尺寸区域内由自旋转移力矩驱动。这些结果描绘了在实际系统中激发……必须优化的重要材料参数。
