Self-oscillation of standing spin wave in ring resonator with proportional-integral-derivative control
Self-oscillation of standing spin wave in ring resonator with proportional-integral-derivative control
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DOI：
10.1063/1.4862222
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发表时间：
2014-01
影响因子：
3.2
通讯作者：
B. Peng;Y. Urazuka;H. Chen;S. Oyabu;H. Otsuki;Terumitsu Tanaka;K. Matsuyama
中科院分区：
文献类型：
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作者：
B. Peng;Y. Urazuka;H. Chen;S. Oyabu;H. Otsuki;Terumitsu Tanaka;K. Matsuyama
本文对由垂直各向异性铁磁纳米线构成的纳米结构有源环形谐振器中自旋驻波的自激振荡进行了数值分析。受限共振模式是沿着纳米线长度。主动环采用正反馈比例积分微分增益控制。在考虑热效应的情况下，利用微磁模拟方法，采用随机场模型，研究了一阶自旋驻波的稳定激发。通过优化比例-积分-微分增益控制参数，在20 ns内获得了旋进幅度为预定变量的稳态自旋驻波。结果表明，正反馈回路从初始热涨落态中提取出一个单色振荡频率fosc，并对其进行选择性放大。得到的fosc值为5.22 GHz，与色散关系的理论预测基本一致。
We report on numerical analysis on self-oscillation of standing spin wave excited in a nanostructured active ring resonator, consists of a ferromagnetic nanowire with perpendicular anisotropy. The confined resonant modes are along the nanowire length. A positive feedback with proportional-integral-derivative gain control was adopted in the active ring. Stable excitation of the 1st order standing spin wave has been demonstrated with micromagnetic simulations, taking into account the thermal effect with a random field model. The stationary standing spin wave with a pre-determined set variable of precession amplitude was attained within 20 ns by optimizing the proportional-integral-derivative gain control parameters. The result indicates that a monochromatic oscillation frequency fosc is extracted from the initial thermal fluctuation state and selectively amplified with the positive feedback loop. The obtained fosc value of 5.22 GHz practically agrees with the theoretical prediction from dispersion relation ...