Magnons, quantized spin waves arising from collective excitations of spins, are typically considered negligible contributors to heat transfer. However, recent studies on low-dimensional magnetic materials have challenged this notion, revealing significant magnon-mediated heat transport. The underlying physics behind this phenomenon, however, remains poorly understood. In this study, we observed a significant reduction in heat transfer in nickel nanowires under the influence of a magnetic field. Our theoretical model revealed a substantial magnon contribution of up to 30 % to nanowire heat transfer. The reduction in heat transfer under a magnetic field stemmed from a drastic decrease in the magnon mean free path (MFP). This decrease in MFP was primarily attributed to suppressing long wavelength magnons with a longer MFP. Our findings provide deeper insights into heat transfer mechanisms in nanoscale ferromagnetic materials and offer valuable guidance for the design of future spintronic devices.

中文翻译：

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磁振子对镍纳米线传热的显著贡献


磁振子是由自旋的集体激发产生的量子化自旋波，通常被认为对传热的贡献可以忽略不计。然而，最近对低维磁性材料的研究挑战了这一概念，揭示了重要的磁振子介导的热传递。然而，人们对这种现象背后的基本物理学仍然知之甚少。在这项研究中，我们观察到在磁场的影响下镍纳米线的传热显着减少。我们的理论模型揭示了磁振子对纳米线传热的贡献高达 30%。磁场下传热的减少源于磁振子平均自由程 （MFP） 的急剧减少。MFP 的降低主要归因于用较长的 MFP 抑制了长波长磁振子。我们的研究结果为纳米级铁磁材料的传热机制提供了更深入的见解，并为未来自旋电子器件的设计提供了有价值的指导。