论文标题
旋转波电磁纳米 - 安宁纳通过三方声子 - 马格诺 - 光子耦合启用
Spin Wave Electromagnetic Nano-Antenna Enabled by Tripartite Phonon-Magnon-Photon Coupling
论文作者
论文摘要
我们研究了在压电底物上划定的椭圆形磁磁性纳米磁体的周期性磁子和光子之间的三方耦合，以形成二维两相多胶质体晶体。在底物中发射的5-35 GHz频率的表面声波（声子）导致纳米磁体的磁性在波浪频率下进行prepess，从而引起自旋波（镁质）。旋转波反过来将电磁波（光子）辐射到表面声波频率下的周围空间。在这里，声子夫妇陷入了磁子，然后将它们夫妇融入光子中。利用这种三方声子 - 马格诺 - 光子耦合来实现极端的亚波长电磁天线，在某些频率下，其测量的辐射效率和天线增益超过了传统天线的理论极限。微磁模拟与实验观测非常吻合，并提供了对旋转波模式的洞察力，这些模式将它们融入辐射电磁模式以实现天线。
We investigate tripartite coupling between phonons, magnons and photons in a periodic array of elliptical magnetostrictive nanomagnets delineated on a piezoelectric substrate to form a two-dimensional two-phase multiferroic crystal. A surface acoustic wave (phonons) of 5 - 35 GHz frequency launched into the substrate causes the magnetizations of the nanomagnets to precess at the frequency of the wave, giving rise to spin waves (magnons). The spin waves, in turn, radiate electromagnetic waves (photons) into the surrounding space at the surface acoustic wave frequency. Here, the phonons couple into magnons, which then couple into photons. This tripartite phonon-magnon-photon coupling is exploited to implement an extreme sub-wavelength electromagnetic antenna whose measured radiation efficiency and antenna gain exceed the theoretical limits for traditional antennas by more than two orders of magnitude at some frequencies. Micro-magnetic simulations are in excellent agreement with experimental observations and provide insight into the spin wave modes that couple into radiating electromagnetic modes to implement the antenna.
