Evaluation of thermal gradients in longitudinal spin Seebeck effect measurements
Evaluation of thermal gradients in longitudinal spin Seebeck effect measurements
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DOI：
10.1063/1.4916762
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发表时间：
2015-05-07
影响因子：
3.2
通讯作者：
Saitoh, E.
中科院分区：
文献类型：
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作者：
Sola, A.;Kuepferling, M.;Saitoh, E.
在纵向自旋Seebeck效应（LSSE）的框架下，我们开发了一个实验装置的LSSE器件的特性。这类器件包括由衬底形成的分层结构、热产生自旋电流的亚铁磁绝缘体（YIG）和用于经由逆自旋霍尔效应检测自旋电流的顺磁金属（Pt）。在这种实验中，通过薄YIG层的热梯度的评估是一个关键点。在这项工作中，我们通过测量热流来间接确定热梯度。我们开发了一种使用Peltier电池的实验装置，使我们能够测量通过给定样品的热通量。为了测试该技术，东北大学生产的标准LSSE设备进行了测量。我们发现自旋Seebeck S-SSE系数为2：8 × 10（-7）V K-1。(C)2015 AIP Publishing LLC.
In the framework of the longitudinal spin Seebeck effect (LSSE), we developed an experimental setup for the characterization of LSSE devices. This class of device consists in a layered structure formed by a substrate, a ferrimagnetic insulator (YIG) where the spin current is thermally generated, and a paramagnetic metal (Pt) for the detection of the spin current via the inverse spin-Hall effect. In this kind of experiments, the evaluation of a thermal gradient through the thin YIG layer is a crucial point. In this work, we perform an indirect determination of the thermal gradient through the measurement of the heat flux. We developed an experimental setup using Peltier cells that allow us to measure the heat flux through a given sample. In order to test the technique, a standard LSSE device produced at Tohoku University was measured. We find a spin Seebeck S-SSE coefficient of 2: 8 X 10(-7) V K-1. (C) 2015 AIP Publishing LLC.