论文标题
超薄YIG波导中的非线性光谱移位与自旋波的非线性阻尼之间的相互作用
Interplay between nonlinear spectral shift and nonlinear damping of spin waves in ultrathin YIG waveguides
论文作者
论文摘要
我们使用相位分辨的成像直接研究在100 nm厚的，平面内磁性的YIG波导中传播的自旋波长的非线性修饰。我们表明，通过使用中等的微波功率，可以实现旋转波，其振幅较大，对应于超过10度的进动角度，而在该系统中的非线性波长变化高达18％。我们还发现，从很大的进动角度上，自旋波的传播受非线性阻尼的发作的强烈影响，这导致波长的空间依赖性很强。这种效果导致微波功率对波长的空间依赖性可控性。此外，它导致非线性光谱移位的效果远离激发点的饱和。这些发现对于开发非线性，集成的自旋波信号处理设备很重要，可用于优化其特性。
We use the phase-resolved imaging to directly study the nonlinear modification of the wavelength of spin waves propagating in 100-nm thick, in-plane magnetized YIG waveguides. We show that, by using moderate microwave powers, one can realize spin waves with large amplitudes corresponding to precession angles in excess of 10 degrees and nonlinear wavelength variation of up to 18 percent in this system. We also find that, at large precession angles, the propagation of spin waves is strongly affected by the onset of nonlinear damping, which results in a strong spatial dependence of the wavelength. This effect leads to a spatially dependent controllability of the wavelength by the microwave power. Furthermore, it leads to the saturation of nonlinear spectral shift's effects several micrometers away from the excitation point. These findings are important for the development of nonlinear, integrated spin-wave signal processing devices and can be used to optimize their characteristics.
