Tolerance of spin-Seebeck thermoelectricity against irradiation by swift heavy ions

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  • スピンゼーベック熱電能の高速重イオン照射に対する耐性

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The ion-irradiation tolerance of thermoelectric devices based on the spin Seebeck effect (SSE) was investigated by using 320 MeV gold ion (Au$^{24+}$) beams modeling cumulative damages due to fission products emitted from the surface of spent nuclear fuels. For this purpose, prototypical Pt/Y$_3$Fe$_5$O$_{12}$/Gd$_3$Ga$_5$O$_{12}$ SSE elements were irradiated with varying the dose level at room temperature and measured the SSE voltage of them. We confirmed that the thermoelectric and magnetic properties of the SSE elements are not affected by the ion-irradiation up to $10^{10}$ ions/cm$^2$ fluence and that the SSE signal is extinguished around $10^{12}$ ions/cm$^2$, in which the ion tracks almost fully cover the sample surface. We also performed the hard X-ray photoemission spectroscopy (HAXPES) measurements to understand the effects at the interface of Pt/Y$_3$Fe$_5$O$_{12}$. The HAXPES measurements suggest that the chemical reaction that diminishes the SSE signals is enhanced with the increase of the irradiation dose. The present study demonstrates that SSE-based devices are applicable to thermoelectric generation even in harsh environments for a long time period.

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