Role of Damping in Spin Seebeck Effect in Yttrium Iron Garnet Thin Films

  • Authors:
    Houchen Chang (Colorado State), Pasdunkorale A. Janantha (Colorado State), Jinjun Ding (Colorado State), Tao Liu (Colorado State), Kevin Cline (Colorado State), Joseph N. Gelfand (Colorado State), Wei Li (Colorado State), Mario Marconi (Colorado State), Mingzhong Wu (Colorado State)
    Publication ID:
    P090786
    Publication Type:
    Paper
    Received Date:
    1-May-2017
    Last Edit Date:
    2-May-2017
    Research:
    2381.001 (Johns Hopkins University)
    2381.006 (University of Minnesota)

Abstract

The role of damping in the spin Seebeck effect (SSE) was studied experimentally for the first time. The experiments used Y3Fe5O12 (YIG)/Pt bilayered structures where the YIG films exhibit very similar structural and static magnetic properties but very different damping. The data show that a decrease in the damping gives rise to an increase in the SSE coefficient, which is qualitatively consistent with some of the theoretical models. This response also shows quasi-linear behavior, which was not predicted explicitly by previous studies. The data also indicate that the SSE coefficient shows no notable correlations with the enhanced damping due to spin pumping, which can be understood in the frame of two existing models.

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