Spin Seebeck insulator

Details Spin Seebeck insulator Spin Seebeck insulator

2010-09-29

arxiv.org/abs/1009.5766v1

Nature Materials (2010)

Physics

Condensed Matter

Materials Science

19 pages, 5 figures (including supplementary information)

Scientific paper

10.1038/NMAT2856

Thermoelectric generation is an essential function of future energy-saving technologies. However, this generation has been an exclusive feature of electric conductors, a situation which inflicts a heavy toll on its application; a conduction electron often becomes a nuisance in thermal design of devices. Here we report electric-voltage generation from heat flowing in an insulator. We reveal that, despite the absence of conduction electrons, a magnetic insulator LaY2Fe5O12 converts a heat flow into spin voltage. Attached Pt films transform this spin voltage into electric voltage by the inverse spin Hall effect. The experimental results require us to introduce thermally activated interface spin exchange between LaY2Fe5O12 and Pt. Our findings extend the range of potential materials for thermoelectric applications and provide a crucial piece of information for understanding the physics of the spin Seebeck effect.

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