The spin current is significantly limited by the spin‐orbit interaction strength, material quality, and spin‐mixing conductance at material interfaces. Such limitations lead to spin current decay at the interfaces, which severely hinders potential applications in spin‐current‐generating thermoelectric devices. Thus, methodical studies on the enhancement of spin currents are indispensable. Herein, a novel approach for enhancing the spin current injected into a normal metal, Pt, using interface effects with a ferromagnetic insulator, yttrium iron garnet (YIG), is demonstrated. This is accomplished by inserting atomically thin monolayer (ML), tungsten diselenide (WSe₂) between Pt and YIG layers. A comparative study of longitudinal spin Seebeck effect (LSSE) measurements is conducted. Two types of ML WSe₂ (continuous and large‐area ML WSe₂ and isolated ML WSe₂ flakes) are used as intermediate layers on YIG film. Notably, the insertion of ML WSe₂ between the Pt and YIG layers significantly enhances the thermopower, V_LSSE/ΔT by a factor of approximately 5.6 compared with that of the Pt/YIG reference sample. This enhancement in the measured LSSE voltages in the Pt/ML WSe₂/YIG trilayer can be explained by the increased spin‐to‐charge conversion at the interface owing to the large spin‐orbit coupling and improved spin mixing conductance with the ML WSe₂ intermediate layer.

中文翻译：

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由于界面强注入自旋电流，增强了单层二硒钨的自旋塞贝克效应

自旋电流受到自旋轨道相互作用强度，材料质量和材料界面处自旋混合电导的显着限制。这些限制导致自旋电流在界面处衰减，从而严重阻碍了在产生自旋电流的热电设备中的潜在应用。因此，关于提高自旋电流的方法学研究是必不可少的。本文中，展示了一种新颖的方法，该方法利用与铁磁绝缘体钇铁石榴石（YIG）的界面效应来增强注入正常金属Pt中的自旋电流。这是通过在Pt和YIG层之间插入原子薄的单层（ML），二硒化钨（WSe ₂）来实现的。进行了纵向自旋塞贝克效应（LSSE）测量的比较研究。两种ML WSe₂（连续和大面积的ML WSE ₂和分离ML WSE ₂薄片）被用作上YIG薄膜的中间层。值得注意的是，与Pt / YIG参考样品相比，在Pt和YIG层之间插入ML WSe _2可以显着提高热_功率V _LSSE / ΔT约5.6。Pt / ML WSe ₂ / YIG三层中测得的LSSE电压的这种增强可以解释为，由于自旋轨道耦合较大，以及与ML WSe _2的自旋混合电导率提高，界面处的自旋电荷转换增加中间层。