论文标题
自称交换旋转波的深度非线性激发
Deeply nonlinear excitation of self-normalised exchange spin waves
论文作者
论文摘要
自旋波是用于基于波浪的计算的理想候选者，但是由于缺乏有效的机制来激发具有归一化振幅的长期交换旋转波，因此阻止了磁回路的构造。在这里，我们通过利用200 nm宽的纳米级波导中的前体积旋转波的深度非线性现象来解决挑战，并通过微心焦点的布里鲁因光散射光谱法验证我们的概念。实现了> 2 GHz的前所未有的非线性频移，对应于55°的磁化预进点角，并能够激发其效率> 80％的波长低至十纳米的波长的激发。激发自旋波的幅度是恒定的，并且由于自锁定的非线性移位而与输入微波功率无关，从而在未来的芯片宏伟宏伟的岩石集成电路中对旋转波幅度的稳健调整。
Spin waves are ideal candidates for wave-based computing, but the construction of magnetic circuits is blocked by a lack of an efficient mechanism to excite long-running exchange spin waves with normalised amplitudes. Here, we solve the challenge by exploiting the deeply nonlinear phenomena of forward-volume spin waves in 200 nm wide nanoscale waveguides and validate our concept with microfocused Brillouin light scattering spectroscopy. An unprecedented nonlinear frequency shift of >2 GHz is achieved, corresponding to a magnetisation precession angle of 55° and enabling the excitation of exchange spin waves with a wavelength of down to ten nanometres with an efficiency of >80%. The amplitude of the excited spin waves is constant and independent of the input microwave power due to the self-locking nonlinear shift, enabling robust adjustment of the spin wave amplitudes in future on-chip magnonic integrated circuits.
