Magnonic holographic imaging of magnetic microstructures
Magnonic holographic imaging of magnetic microstructures
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DOI：
10.1016/j.jmmm.2016.12.022
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发表时间：
2017-04
影响因子：
2.7
通讯作者：
D. Gutierrez;H. Chiang;T. Bhowmick;A. Volodchenkov;M. Ranjbar;Guanxiong Liu;C. Jiang;C. Warren;Y. Khivintsev;Y. Filimonov;J. Garay;R. Lake;A. Balandin;A. Khitun
中科院分区：
文献类型：
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作者：
D. Gutierrez;H. Chiang;T. Bhowmick;A. Volodchenkov;M. Ranjbar;Guanxiong Liu;C. Jiang;C. Warren;Y. Khivintsev;Y. Filimonov;J. Garay;R. Lake;A. Balandin;A. Khitun
我们提出并演示了一种通过磁性微结构与传播自旋波的相互作用进行成像的技术。在这种方法中，感兴趣的物体被放置在由低自旋波阻尼材料制成的磁性测试台的顶部。测试台中装有微型天线。其中两个天线用于自旋波激励，而另一个用于检测干扰自旋波产生的感应电压。针对自旋波生成天线之间的不同相位差重复测量，这相当于改变照射角度。收集到的数据显示为 3D 图——物体的全息图像。我们提供的实验数据显示了低矫顽力 Si/Co 样品、由 SrFe12O19 制成的高矫顽力样品和抗磁性铜样品的磁波全息图像。我们还展示了由不同含量的 SrFe12O19 粉末组成的三个样品的图像。成像是在室温下在 Y3Fe2(FeO4)3 测试台上完成的。获得的数据揭示了物体独特的磁波特征。实验数据得到数值建模结果的补充，定性地解释了图像的特征。磁波全息成像可以补充现有技术，并可用于无损原位磁性物体表征。还讨论了这种方法的基本物理限制。
We propose and demonstrate a technique for magnetic microstructure imaging via their interaction with propagating spin waves. In this approach, the object of interest is placed on top of a magnetic testbed made of material with low spin wave damping. There are micro-antennas incorporated in the testbed. Two of these antennas are used for spin wave excitation while another one is used for the detecting of inductive voltage produced by the interfering spin waves. The measurements are repeated for different phase differences between the spin wave generating antennas which is equivalent to changing the angle of illumination. The collected data appear as a 3D plot – the holographic image of the object. We present experimental data showing magnonic holographic images of a low-coercivity Si/Co sample, a high-coercivity sample made of SrFe12O19and a diamagnetic copper sample. We also present images of the three samples consisting of a different amount of SrFe12O19powder. The imaging was accomplished on a Y3Fe2(FeO4)3testbed at room temperature. The obtained data reveal the unique magnonic signatures of the objects. Experimental data is complemented by the results of numerical modeling, which qualitatively explain the characteristic features of the images. Potentially, magnonic holographic imaging may complement existing techniques and be utilized for non-destructive in-situ magnetic object characterization. The fundamental physical limits of this approach are also discussed.