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arXiv 2203.04018cond-mat.mes-hallphysics.app-phphysics.optics
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双折射YIG波导中自旋波非线性谱移与非线性阻尼的相互作用

Interplay between nonlinear spectral shift and nonlinear damping of spin waves in ultrathin YIG waveguides

S. R. Lake, B. Divinskiy, G. Schmidt, S. O. Demokritov, V. E. Demidov

摘要:

我们使用相位分辨成像直接研究自旋波在100 nm厚的面内磁化YIG波导中传播的波长的非线性修改。我们表明,通过使用适度的微波功率,可以实现自旋波与大振幅对应的进动角超过10度和非线性波长的变化高达18%,在这个系统中。我们还发现,在大的旋进角,自旋波的传播是强烈的非线性阻尼,这导致在一个很强的空间依赖性的波长的发病影响。这种效应导致微波功率对波长的空间依赖可控性。在离激发点几微米处,非线性谱移效应达到饱和。这些发现对于非线性、集成自旋波信号处理器件的发展具有重要意义,并可用于优化其特性。

英文摘要:

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.

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