Interfacial contribution to the measured spin Seebeck effect in La0.7Ca0.3MnO3 thin films

The spin Seebeck effect (SSE) is an exciting phenomenon for next generation energy harvesting, which is often observed by measuring the voltage generated in a thin Pt layer on the magnetic layer. It is critical to probe the impact of structural and magnetic morphology of SSE materials for technological realisation. We have reported on the temperature dependence of the SSE and the magnetisation in La0.7Ca0.3MnO3 (LCMO) and the SSE voltage show significantly different variations indicating that in addition to the bulk, there might be an interfacial contribution to the SSE. Since identifying the role of the interface in the SSE is important to improve the efficiency of spintronic and SSE based devices, we propose using PNR to determine whether there is a subtle change in the interfacial magnetisation that enhances/impedes the SSE.

自旋塞贝克效应（Spin Seebeck effect, SSE）是下一代能量收集领域中一种令人振奋的现象，通常可通过测量磁性层上Pt薄层中产生的电压来观测该效应。为实现其技术应用，探究SSE材料的结构与磁形态对该效应的影响至关重要。我们已报道了La0.7Ca0.3MnO3（LCMO）中SSE与磁化强度的温度依赖性，且观测到SSE电压呈现显著不同的变化趋势——这表明除体相贡献外，界面也可能对SSE产生影响。鉴于明确界面在SSE中的作用对提升自旋电子器件及SSE基器件的效率至关重要，我们提出利用PNR技术来确定界面磁化强度是否存在可增强/抑制SSE的细微变化。