磁极子极化子的超快传播
Ultrafast propagation of magnon-polaritons
AI总结：
该研究展示了磁极子极化子的超快传播，其速度超过100 km/s，为未来自旋计算提供高速信息传输的可能。
摘要：
磁化操控是磁电子和磁性技术的核心，此类系统的最终性能受限于磁激发能传播的速度。在这里，我们展示了磁极子极化子的超快传播——这些混合准粒子源于在薄纯、铋取代和镓取代的钇铁 garnet（YIG、Bi:YIG 和 Ga:YIG）薄膜中自旋波与电磁场的耦合。利用时域和相域布里渊光散射显微镜以及时域扫描透射显微镜，我们证明磁极子极化子的速度可超过 100 km/s，比传统自旋波快三个数量级，并且在 20 nm 厚的薄膜中可观察到超过 40 微米的距离。基于迟滞麦克斯韦方程和 Polder 张量形式的分析模型确认了这些激发的混合性质，并捕捉到了非平凡的色散和衰减特性。值得注意的是，磁极子极化子保持高初始磁化幅度和长衰减长度，使磁化在远离激发源的地方实现超快操控。我们展示了它们可以移动磁畴壁或稳定非线性磁化过程。前所未有的高速传播使磁极子极化子成为未来基于自旋的计算架构中高速信息传输的有前途的候选者，可能克服磁性逻辑电路中长期存在的群延迟瓶颈。
英文摘要：
The manipulation of magnetization lies at the heart of spintronic and magnonic technologies, with the ultimate performance of such systems limited by the velocity at which magnetic excitations can propagate. Here, we demonstrate ultrafast propagation of magnon-polaritons-hybrid quasiparticles arising from the coupling between spin waves and electromagnetic fields in thin pure, bismuth-, and gallium substituted yttrium iron garnet (YIG, Bi:YIG and Ga:YIG) films. Using time- and phase-resolved Brillouin light scattering microscopy and time-resolved scanning transmission microscopy, we show that magnon-polaritons can propagate faster than 100 km/s, nearly three orders of magnitude more than conventional spin waves, and can be observed at distances exceeding 40 micrometers in 20 nm thick films. Analytical modeling based on retarded Maxwell equations and Polder tensor formalism confirms the hybridized nature of the excitations and captures the nontrivial dispersion and attenuation profiles. Notably, the magnon-polaritons maintain high initial magnetization amplitudes and long decay lengths, enabling ultrafast manipulation of the magnetization far away from the excitation source. We show, that they can move domain walls or stabilize nonlinear magnetization processes. The unprecedentedly high propagation velocities make magnon-polaritons promising candidates for high-speed information transfer in future spin-based computing architectures, potentially overcoming long-standing group delay bottlenecks in magnonic logic circuits.
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