论文标题
从铁磁膜边缘反射的自旋波相的共振次波长控制
Resonant subwavelength control of the phase of spin waves reflected from a ferromagnetic film edge
论文作者
论文摘要
使用与微磁模拟交叉检查的频域有限元计算，我们证明了自旋波相反射的旋转波相反射从薄膜和双层之间的界面反射，可以通过改变双层的尺寸来控制。将由Persalloy膜形成的双层和铁磁条带作为多模式波导的一部分，我们表明其一种模式之一的自旋波Fabry-perot共振是导致反射波的阶段高灵敏度的，以使其具有条纹宽度和条纹宽度和条纹 - 细分分离。因此，该系统是基于两种模型谐振器的全宏伟的Gires-Tournois干涉仪的独特实现，该干涉仪可以被视为元脉冲的宏伟对应物，因为它可以在亚波长距离处操纵自旋波的相位。从这些计算中获得的知识可用于设计宏伟的设备，例如扁平透镜或磁性颗粒探测器。
Using frequency-domain finite element calculations cross-checked with micromagnetic simulations, we demonstrate that the phase of spin waves reflected from an interface between a permalloy film and a bilayer can be controlled by changing dimensions of the bilayer. Treating the bilayer formed by the permalloy film and a ferromagnetic stripe as a segment of a multi-mode waveguide, we show that spin-wave Fabry-Perot resonances of one of its modes are responsible for the high sensitivity of the phase of reflected waves to stripe width and the stripe-film separation. Thus, the system is a unique realization of a fully magnonic Gires-Tournois interferometer based on a two-modes resonator, which can be treated as a magnonic counterpart of a metasurface, since it enables manipulation of the phase of spin waves at subwavelength distances. Knowledge gained from these calculations might be used to design magnonic devices such as flat lenses or magnetic particle detectors.
