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위상 절연체 Bi₂Se₃와 강자성 NiFe 사이에 MgO 층 삽입 효과 연구
정선재(Sunjae Chung),Sheng Jiang,Johan Akerman,이상훈(Sanghoon Lee) 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.1
We study ferromagnetic resonance (FMR) properties of topological insulator Bi₂Se₃ and ferromagnet NiFe (permalloy) multilayer structures. We found that Bi₂Se₃/NiFe shows two times larger magnetic damping than that of single NiFe, which indicates strong spin pumping exists in the interface between Bi₂Se₃ and NiFe. Also, 1 nm thick MgO layer was inserted into between Bi₂Se₃ and NiFe, where spin-pumping is expected to be suppressed. Bi₂Se₃/MgO/NiFe shows same amount of spin-pumping effect as observed in Bi₂Se₃/NiFe, while thin MgO layer can be beneficial for suppressing the formation of magnetic dead layer. These results show that 1 nm thick MgO can be utilized as a good spacer layer without a loss of spin-pumping in the multilayer structures with topological insulator.