论文标题
飞秒激光脉冲驱动的苛性自旋波梁
Femtosecond laser pulse driven caustic spin wave beams
论文作者
论文摘要
控制自旋波的方向性是基于波浪的计算方法（例如磁纳学）的关键要素。在本文中，我们通过使用基于频率梳子快速消除电磁的全光点状旋转波的全光点状来证明了这一特定方面。发射的自旋波包含一系列K-向量，并通过使施加的磁场略微从铁磁共振（FMR）中略微吸收，我们观察到X形的苛性旋转波模式，以$ 70^{\ circ} $ procagagation Angions的预测，根据理论预测。当光源的谐波接近FMR时，腐蚀性模式让位于垂直于施加场的平面成分的单轴自旋波传播。在设计宏伟的设备时，这种野外控制的传播模式和方向性为额外的自由度提供了额外的自由度。
Controlling the directionality of spin waves is a key ingredient in wave-based computing methods such as magnonics. In this paper, we demonstrate this particular aspect by using an all-optical point-like source of continuous spin waves based on frequency comb rapid demagnetization. The emitted spin waves contain a range of k-vectors and by detuning the applied magnetic field slightly off the ferromagnetic resonance (FMR), we observe X-shaped caustic spin-wave patterns at $70^{\circ}$ propagation angles as predicted by theory. When the harmonic of the light source approaches theFMR, the caustic pattern gives way to uniaxial spin-wave propagation perpendicular to the in-plane component of the applied field. This field-controlled propagation pattern and directionality of optically emitted short-wavelength spin waves provide additional degrees of freedom when designing magnonic devices.
