Power-Dependent Characteristics of Spin Current Transfer in Metal Bilayer Devices under High-Power Pulse Excitation
Power-Dependent Characteristics of Spin Current Transfer in Metal Bilayer Devices under High-Power Pulse Excitation
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高功率脉冲激励下金属双层器件中自旋电流传输的功率相关特性
DOI：
10.1021/acsami.2c03418
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发表时间：
2022
影响因子：
9.5
通讯作者：
Katsuichi Kanemoto
中科院分区：
文献类型：
--
作者：
Kenta Nakahashi;Kohei Takaishi;Takayuki Suzuki;Katsuichi Kanemoto
在从几十毫瓦到396 W的宽功率范围内研究了坡莫合金/Pt双层器件界面处产生的自旋电流的功率依赖性传输特性。我们建立了一个高功率脉冲激励系统的自旋泵，它实现了大电动势（EMF）值为10 mV，在396 W的激励通过逆自旋霍尔效应（ISHE），并表明脉冲激励后的电动势的产生是非常快的。在大于80 W的强脉冲微波激励下，电动势谱呈现出不对称的线形，这是很好地再现了模拟，考虑到由于非线性铁磁共振激励的折叠效应。在低于80 W的功率范围内，通过自旋泵浦和ISHE在外部负载下的最大输出功率与输入微波功率（Pin）的平方成比例地增加。这种与Pin 2成比例的发电是自旋电流介导的功率流所独有的。在具有折叠型电动势谱的强激发区域中，发现峰值磁场位置的电动势值由于谱增宽而线性增加较小。该特征可用于相对于输入激励功率非线性地增加的发电，其中通过改变磁场位置来调节非线性。
The power-dependent transfer characteristics of spin currents generated at the interface of the permalloy/Pt bilayer device have been investigated over a wide power range from a few tens of milliwatt to 396 W. We built a high-power pulse excitation system for spin pumping, which achieves large electromotive force (EMF) values of 10 mV at 396 W excitation through the inverse spin Hall effect (ISHE) and demonstrates that the EMF generation after pulse excitation is very fast. Under strong pulse microwave excitation more than 80 W, the EMF spectrum exhibits an asymmetrical lineshape, which is well reproduced by simulations that take into account the fold-over effect due to the nonlinear ferromagnetic resonance excitation. The maximum output power at an external load through spin pumping and the ISHE is shown to increase in proportion to the square of the input microwave power (Pin) in the power range below 80 W. This power generation proportional toPin2is unique to spin current-mediated power flow. In the strong excitation regime with the fold-over type EMF spectra, the EMF values of the peak magnetic field position are found to increase less linearly due to spectral broadening. This feature can be used for power generation that increases nonlinearly with respect to the input excitation power, where the nonlinearity is adjusted by varying the magnetic field position.