非绝热自旋力矩对磁涡旋核的电流诱导共振运动的影响
Current-Induced Resonant Motion of a Magnetic Vortex Core: Effect of Nonadiabatic Spin Torque
摘要：
通过解析和微磁学计算研究了磁涡旋核的电流感应共振激发。我们发现，由于涡核的动态畸变，解析方程不能正确描述共振运动的半径和相移。相反，涡核的初始倾斜角不受畸变的影响，并由自旋力矩的非绝热性决定。它对实验上不可控的电流诱导的面内奥斯特场不敏感。我们提出，核心初始轨迹的时间分辨成像对于实验估计非绝热性至关重要。
英文摘要：
The current-induced resonant excitation of a magnetic vortex core is investigated by means of analytical and micromagnetic calculations. We find that the radius and the phase shift of the resonant motion are not correctly described by the analytical equations because of the dynamic distortion of a vortex core. In contrast, the initial tilting angle of a vortex core is free from the distortion and determined by the nonadiabaticity of the spin torque. It is insensitive to experimentally uncontrollable current-induced in-plane Oersted field. We propose that a time-resolved imaging of the very initial trajectory of a core is essential to experimentally estimate the nonadiabaticity.
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