Yuki Shiomi

Affiliations

• Institute for Materials Research, Tohoku University, Japan
• ERATO-SQR, JST, Japan

Title

Spin pumping experiments in topological insulators and skyrmion crystals

Abstract

Detection and manipulation of electron spin are the key prerequisites for spintronics. Here, we report spin pumping experiments for topological materials: topological insulators [1] and skyrmion crystals [2]. Using bulk-insulating topological-insulator materials Bi_1.5Sb_0.5Te_1.7Se_1.3 and Sn-doped Bi₂Te₂Se, we successfully observed spin-electricity conversion due to the spin-momentum locking on the topological surface state [1]. For skyrmion crystals, we demonstrated the spin current injection from the skyrmion crystal phase of Cu₂OSeO₃ to an attached Pt film [2]. These results should be important for future spintronics application of topological insulators and skyrmion crystals.

References

• [1] Y. Shiomi, K. Nomura, Y. Kajiwara, K. Eto, M. Novak, K. Segawa, Y. Ando, and E. Saitoh, Spin-electricity conversion induced by spin injection into topological insulators, Phys. Rev. Lett. 113, 196601 (2014).

• [2] D. Hirobe, Y. Shiomi, Y. Shimada, J. Ohe, and E. Saitoh, Generation of spin currents in the skyrmion phase of a helimagnetic insulator Cu₂OSeO₃, J. Appl. Phys. 117, 053904 (2015).