论文标题
磁性石榴石中的短距离热镁扩散
Short-range Thermal Magnon Diffusion in Magnetic Garnet
论文作者
论文摘要
使用自旋Seebeck效果（SSE），我们研究了短距离态度中磁性绝缘子薄膜内热自旋电流的传播距离。我们通过比较在同一设备上添加热封盖层之前和之后的SSE信号来消除由温度和化学势梯度驱动的自旋电流。我们报告说，在热源附近的测得的自旋衰减行为通过扩散模型很好地解释了镁扩散长度在亚微米范围内，\ textIt {i.e。}比从远距离行为推论的先前估计值小两个数量级。我们的结果突出了使用扩散理论来描述热镁传输的注意事项，其中单个衰减长度可能无法捕获所有长度尺度上的行为。
Using the spin Seebeck effect (SSE), we study the propagation distance of thermal spin currents inside a magnetic insulator thin film in the short-range regime. We disambiguate spin currents driven by temperature and chemical potential gradients by comparing the SSE signal before and after adding a thermalization capping layer on the same device. We report that the measured spin decay behavior near the heat source is well accounted for by a diffusion model where the magnon diffusion length is in submicron range, \textit{i.e.} two orders of magnitude smaller than previous estimates inferred from the long-range behavior. Our results highlight the caveat in applying a diffusive theory to describe thermal magnon transport, where a single decay length may not capture the behavior on all length scales.
