Magnon propagation length in a ferrimagnetic insulator yttrium-iron-garnet (YIG) has been investigated by measuring the YIG-thickness t_YIG dependence of the spin Peltier effect (SPE) in a Pt/YIG sample. We succeeded to measure the high-resolution t_YIG dependence of SPE by using the thermal imaging of SPE free from contamination by interference of infrared emissivity. Comparison between the experimental results and theoretical analyses demonstrates the existence of two propagation lengths for the magnon chemical potential and the magnon temperature.

中文翻译：

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通过热成像技术可视化自旋珀耳帖效应的厚度依赖性

通过测量 Pt/YIG 样品中自旋珀耳帖效应 (SPE) 的 YIG 厚度 t_YIG 依赖性，研究了亚铁磁绝缘体钇铁石榴石 (YIG) 中的磁振子传播长度。我们通过使用不受红外发射率干扰污染的 SPE 的热成像，成功地测量了 SPE 的高分辨率 t_YIG 依赖性。实验结果与理论分析的比较表明，磁振子化学势和磁振子温度存在两种传播长度。