Quantitative Temperature Dependence of Longitudinal Spin Seebeck Effect at High Temperatures

Abstract

This article reports temperature-dependent measurements of longitudinal spin Seebeck effects (LSSEs) in Pt/Y${}_3$Fe${}_5$O${}_{12}$ (YIG)/Pt systems in a high temperature range from room temperature to above the Curie temperature of YIG. The experimental results show that the magnitude of the LSSE voltage in the Pt/YIG/Pt systems rapidly decreases with increasing the temperature and disappears above the Curie temperature. The critical exponent of the LSSE voltage in the Pt/YIG/Pt systems at the Curie temperature was estimated to be 3, which is much greater than that for the magnetization curve of YIG. This difference highlights the fact that the mechanism of the LSSE cannot be explained in terms of simple static magnetic properties in YIG.

arXiv comment9 pages, 5 figures, 1 table

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