Linewidth of power spectrum originated from thermal noise in spin torque oscillator
Linewidth of power spectrum originated from thermal noise in spin torque oscillator
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DOI：
10.7567/apex.7.053004
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发表时间：
2014-04
影响因子：
2.3
通讯作者：
T. Taniguchi
中科院分区：
文献类型：
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作者：
T. Taniguchi
通过求解能量相位表示中的随机 Landau-Lifshitz-Gilbert 方程，建立了具有垂直磁化自由层和面内磁化固定层的自旋扭矩振荡器中由热激活引起的线宽的理论公式。结果表明，通过施加大电流（典型材料参数为 10 mA），线宽可以抑制到 0.1 MHz。在大电流限制下预计品质因数将大于 104，这比最近观察到的实验值大两个数量级。
A theoretical formula for the linewidth caused by thermal activation in a spin torque oscillator with a perpendicularly magnetized free layer and an in-plane magnetized pinned layer was developed by solving the stochastic Landau–Lifshitz–Gilbert equation in the energy-phase representation. It is shown that the linewidth can be suppressed to 0.1 MHz by applying a large current (10 mA for typical material parameters). A quality factor larger than 104 is predicted in the large current limit, which is two orders of magnitude larger than a recently observed experimental value.