缩颈波导中磁子激光的计算机模拟设计
In silico design of magnonic lasing in constricted waveguides
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中文总结 AI 辅助
本研究通过计算机模拟在缩颈铁磁波导中实现磁子黑洞现象，证实双孔腔可实现自旋波共振放大，提出的设计原理可用于引力系统磁子类及先进自旋电子学应用。
中文摘要 AI 辅助
类黑洞系统已在包括磁性材料在内的多种物理平台中被提出，提供了丰富的物理现象和诸如波激射之类的有前景的应用，然而其实际实现与表征仍大多未被探索。在此，我们开展了由自旋极化电流驱动的缩颈铁磁波导中磁子黑洞现象的计算机模拟研究，采用结合二维泊松求解器的微磁模拟以获取真实的电流密度分布，证实了由类事件视界界定的双孔腔的形成，该腔可实现自旋波的共振放大。我们依据磁性参数与几何参数对共振进行表征，并确定了对应的自旋波模式。我们进一步表明，渐变锥度可通过抑制自旋波反射提升传输效率，而界面Dzyaloshinskii-Moriya相互作用可模拟电流诱导的多普勒频移，大幅降低应用所需的临界电流密度，从而减少焦耳热。最后，我们演示了一种自旋波激光器，其中热激发自旋波在明确定义的共振频率下经历选择性放大与相干发射。这些结果为引力系统的磁子类设计提供了原理，并指向其在先进自旋电子学应用中的潜力。
英文摘要
Analogue black-hole systems have been proposed in various physical platforms, including magnetic materials, offering rich physics and promising applications such as wave lasing. However, their practical realization and characterization remain largely unexplored. Here, we present an in silico study of magnonic black-hole phenomena in constricted ferromagnetic waveguides driven by spin-polarized currents. Using micromagnetic simulations with a two-dimensional Poisson solver to obtain realistic current-density profiles, we demonstrate the formation of a double-hole cavity bounded by analogue event horizons, enabling resonant spin-wave amplification. We characterize the resonances as a function of magnetic and geometric parameters and identify the corresponding spin-wave modes. We further show that gradual tapers enhance transmission by suppressing spin-wave reflections, while interfacial Dzyaloshinskii-Moriya interaction can mimic the current-induced Doppler shift, substantially reducing the critical current density required for applications and, consequently, Joule heating. Finally, we demonstrate a spin-wave laser in which thermally excited spin waves undergo selective amplification and coherent emission at well-defined resonance frequencies. These results provide design principles for magnonic analogues of gravitational systems and point toward their potential for advanced spintronic applications.
发表机构
- University of Antwerp（安特卫普大学）
- Universidade Federal de Pernambuco（伯南布哥联邦大学）
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