The Observation of Spin Seebeck Effect of Hybrid Structure in Bulk Sintering Polycrystalline of Yttrium Iron Oxide (Y₃Fe₅O₁₂)/Pt

Abstract

In this article, we report the observation of spin Seebeck effect (SSE) of hybrid structure in bulk sintering polycrystalline of yttrium iron oxide (Y₃Fe₅O₁₂, YIG)/Pt. The bulk YIG polycrystalline is prepared by solid press mechanic and then coated with Pt 10 nm thickness. The voltage of inverse spin Hall effect (V_ISHE) in Pt/YIG polycrystalline is detected by in plane magnetization configuration (IM) and then filter out the anomalous Nernst effect (ANE) by perpendicular magnetization configuration (PM). The results show that the V_ISHE signal can be observed in bulk YIG polycrystalline. In addition, the efficiency of spin injection from YIG to Pt is compared between Pt/YIG single crystal and bulk polycrystalline of hybrid structure. The V_ISHE signal of Pt/YIG single crystal and bulk polycrystalline are 197.61 nV/K and 23.22 nV/K, respectively. The V_ISHE voltage of YIG single crystal is higher than bulk polycrystalline about 9 times. Whereas, the porous size in bulk YIG polycrystalline of solid press is determined around 214 ± 81 nm but it cannot detect in YIG single crystal. Thus, the porous size and surface roughness between YIG and Pt might be the major role of the spin current (J_s) transfer.

Keywords:

• Spin seebeck effect
• inverse spin seebeck effect
• spin-caloritronics
• spin mixing conductance
• magnetic moment
• ferrimagnetic materials
• single crystal
• polycrystalline

Acknowledgments

The authors would like to thank Yagmur A., Chuewangkam N and Pinitsoontron S. for valuable discussions and Synchrotron Light Research Institute (BL6a) for sample preparation.

Additional information

Funding

This work was supported by King Mongkut’s Institute of Technology Ladkrabang Research Fund [grant number: KREF146102].