Magnon Chemistry

在2021-22财年，我们继续在几个方向上发展磁振子化学。例如，磁子和声子的耦合导致了一种新的磁子分子的发现，这种分子是由两个距离磁铁通过毫米距离上的非磁性间隔物组成的Kittel模式。这项工作得益于对磁弹性边界条件的深入理论分析。我们还通过使用钻石NV中心显微镜的直接成像，确认了在邻近栅极中通过磁非感应涡流来抑制的重要性。通过对铁磁性单层和双层范德华层的解析计算，以及对磁性绝缘体YIG超薄层的研究，我们一直在为2D磁系统中的磁振子奠定基础。利用磁偶极子和电偶极子的类比，我们发明了“铁子”的新领域，它研究铁电有序的基本激发。这一理论研究为国立卫生研究院内田教授领导的新的基班S项目奠定了基础。

In the fiscal year 2021-22, we continued developing the magnon chemistry in several directions. The coupling of magnons with phonons, for example, led to the discovery of a new magnonic molecule of the Kittel mode of two distance magnets through a non-magnetic spacer over mm distances. This work was helped by a thorough theoretical analysis of the magnetoelastic boundary conditions. We also identified the importance of damping by magnon-induced eddy currents in proximity gates by direct imaging using diamond NV-center microscopy. We have been preparing the ground for the magnonics in 2D magnetic systems by carrying out analytic calculation in ferromagnetic single and double van der Waals layers as well as studying ultrathin layers of the magnetic insulator YIG. Making use of the analogies of magnetic and electric dipoles we invented the new field of “ferronics” that studies the elementary excitations of the ferroelectric order. The theoretical study laid the basis of a new Kiban S project led by Prof. K. Uchida from NIMS.