Magnon mediated heat and spin transport in magnetic insulators

对磁振子介导的热和自旋输运的研究不仅从纯科学的角度来看是重要的，而且也有望成为新型自旋电子器件的途径。我们的项目目标是彻底了解磁振子和热流之间的相互作用以及磁绝缘材料薄膜和条纹中的相关输运现象。特别是，我们将解决两个紧密相连的开放问题：(1)当磁振子电流在热非均匀介质中传播时，其性质是如何变化的？(2)磁振子在热传递中究竟起什么作用？作为一个模型系统，我们将研究由钇铁石榴石（YIG）制成的薄膜和自旋波波导。YIG的电绝缘性能和极低的磁阻尼使其成为这一目的的理想材料。布里渊光散射光谱将被用作实验工具。

The investigation of magnon mediated heat and spin transport is not only important from a pure scientific point of view, but also holds promise as a route to novel spintronic devices. Our project targets a thorough understanding of the interplay between magnon- and heat-based currents and the related transport phenomena in films and stripes of magnetic insulating materials. In particular, we will address two strongly interlinked open problems: (1) How do the properties of a magnon current change when as it propagates through a thermally inhomogeneous medium? and, (2) Exactly what role do magnons play in heat transport? As a model system we will study films and spin-wave waveguides made from the Yttrium Iron Garnet (YIG). YIG‘s electrically insulating properties and exceptionally low magnetic damping make it the ideal material for this purpose. As an experimental tool Brillouin light scattering spectroscopy will be employed.