论文标题
带有微米级空间分辨率的正向音量磁声旋转波激发
Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution
论文作者
论文摘要
在压电磁性薄膜异质结构中,表面声波(锯)和自旋波(SWS)之间的相互作用为实现新型微波设备和镁化的应用提供了潜力。在目前的工作中,我们表征了由COFE+GA,COFE和COFE+PT制成的三个相邻的磁性微粒中的磁性波,并用一对锥形跨层间传感器(TIDTS)。通过聚焦的电子束诱导的沉积(Febid)和聚焦离子束诱导的沉积(Fibid)直接编写技术来沉积磁微条纹。利用TIDT的传输特性来选择性地解决单个微纹条。在这里,外部磁场是连续旋转的,从磁性薄膜的平面上旋转,并沿膜正常的外部磁场探测到正音量SW几何形状。我们的实验发现是通过基于修改的Landau-Lifshitz-Gilbert方法的扩展现象学模型来很好地解释的,该模型考虑了具有非零波矢量的SWS。由于垂直剪切应变$ \ varepsilon_ {xz} $的垂直剪切应变$ \ varepsilon_ {xz} $,因此可能对正向音量进行磁弹性激发。
The interaction between surface acoustic waves (SAWs) and spin waves (SWs) in a piezoelectric-magnetic thin film heterostructure yields potential for the realization of novel microwave devices and applications in magnonics. In the present work, we characterize magnetoacoustic waves in three adjacent magnetic micro-stripes made from CoFe+Ga, CoFe, and CoFe+Pt with a single pair of tapered interdigital transducers (TIDTs). The magnetic micro-stripes were deposited by focused electron beam-induced deposition (FEBID) and focused ion beam-induced deposition (FIBID) direct-writing techniques. The transmission characteristics of the TIDTs are leveraged to selectively address the individual micro-stripes. Here, the external magnetic field is continuously rotated out of the plane of the magnetic thin film and the forward volume SW geometry is probed with the external magnetic field along the film normal. Our experimental findings are well explained by an extended phenomenological model based on a modified Landau-Lifshitz-Gilbert approach that considers SWs with nonzero wave vectors. Magnetoelastic excitation of forward volume SWs is possible because of the vertical shear strain $\varepsilon_{xz}$ of the Rayleigh-type SAW.