Study on controllability of spin waves using magnonic crystal and its applications

具有电导率周期性变化的磁子晶体(YIG)可以控制自旋波的传播特性。我们研究了磁子晶体控制自旋波的基本性质。例如，在磁子晶体中引入单缺陷，产生了自旋波的局域化模式。这一现象被应用于磁性传感器。此外，还开发了提高传感器品质因数的新工艺、纳米材料和新的器件结构。这些结果发表在期刊和学术研讨会上。

Magnonic crystals comprising yttrium iron garnet (YIG) with the periodic change of conductivity can control the propagation properties of spin waves. We investigated the fundamental properties on the controllability of spin wave by magnonic crystals. For instance, single defect was introduced into the magnonic crystals and generated the localization mode of spin waves. This phenomenon was applied to the magnonic sensors. And also, the novel processes, nano-scale materials, and new device structures to improve the quality factor of the sensors were developed. These results were reported in journals and academic symposiums.