Spin pumping blocked by single-layer graphene. (2nd July 2015)

• Record Type: Journal Article
• Authors: Haku, Satoshi; Tashiro, Takaharu; Nakayama, Hiroyasu; Ieda, Jun'ichi; Entani, Shiro; Sakai, Seiji; Ando, Kazuya
• Is Part Of: Applied physics express. Volume 8:Number 7(2015:Jul.)
• Publication Date: 2015-07-02
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.8.073009
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We demonstrate that spin pumping in a Ni81 Fe19 /Pt bilayer is strongly suppressed by inserting single-layer graphene (SLG) at the interface. Spin pumping in the Ni81 Fe19 /Pt bilayer enhances the magnetization damping of the ferromagnetic layer, which is quantified from the microwave frequency dependence of the ferromagnetic resonance linewidth. We show that the enhancement of the magnetization damping due to spin pumping disappears in a Ni81 Fe19 /SLG/Pt trilayer. This result indicates that spin pumping is blocked by the atomic monolayer, illustrating the crucial role of interfacial short-range spin–exchange coupling in spin pumping in metallic systems.