自旋波束在梯度refractive index铁磁薄膜中的传播：海市蜃楼效应及应用前景
Spin wave beam propagation in ferromagnetic thin film with graded refractive index: mirage effect and prospective applications
摘要：
利用自旋波色散关系的等频线分析，结合微磁学模拟，研究了自旋波（SW）光束在铁磁薄膜中折射率不均匀区域的传播。我们比较了SW的透射和反射的SW折射率的渐变和阶梯变化的区域。特别是，我们显示了海市蜃楼效应与窄SW光束宽度的SW，和SW的折射率的逐步调制的应用程序作为一个发散透镜。此外，我们还研究了短波在调制折射率的铁磁条中的传播。我们证明了该系统可以被认为是梯度折射率波导，它保持了SW光束的宽度为一个很长的距离-的性能必不可少的应用前景的磁振子。
英文摘要：
Using analysis of iso-frequency contours of the spin-wave dispersion relation, supported by micromagnetic simulations, we study the propagation of spin-wave (SW) beams in thin ferromagnetic films through the areas of the inhomogeneous refractive index. We compare the transmission and reflection of SWs in areas with gradual and step variation of the SW refractive index. In particular, we show the mirage effect for SWs with narrowing SW beam width, and an application of the gradual modulation of the SWs refractive index as a diverging lens. Furthermore, we study the propagation of SWs in ferromagnetic stripe with modulated refractive index. We demonstrate that the system can be considered as the graded-index waveguide, which preserves the width of the SW beam for a long distance-the property essential for prospective applications of magnonics.
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