[17p-Z19-1~7] 10.2 Fundamental and exploratory device technologies for spin

▲ [17p-Z19-1] Control of magnon damping in ultrathin Co by introducing nonmagnetic buffer layers

〇(M1)Shugo Yoshii¹, Ei Shigemastu¹, Ryo Ohshima¹, Yuichiro Ando¹, Masashi Shiraishi¹ (1.Department of Electronic Science and Engineering, Kyoto Univ.)

Keywords:magnon damping, ultra-thin ferromagnetic film, ferromagnetic metallic film

Low-magnon damping in ferromagnetic (FM) metals have been studied to achieve long-distance magnon transportation and strong coupling with photon in them. We realized the significant reduction of magnon damping in 1 nm-thick ultrathin Co by inserting Ta buffer beneath the ultrathin Co, which can expand possibilities in material choices for realizing strong magnon-photon coupling. One of the possible mechanisms to realize the reduction of the magnon damping in ultrathin Co is reduction of the in-plane magnetic anisotropy (IMA) field of Co by insertion of Ta. To study the correlation between magnon damping and IMA field in metallic bilayers, we focus on the other nonmagnets, Ti and Al, because Ti reduces IMA field in Co like Ta and, in contrast, Al shows small change of IMA field in Co.