Detection of ferromagnetic resonance from 1 nm-thick Co

Shugo Yoshii; Ryo Ohshima; Yuichiro Ando; Teruya Shinjo; Masashi Shiraishi

doi:10.1038/s41598-020-72760-7

Detection of ferromagnetic resonance from 1 nm-thick Co

Sci Rep. 2020 Sep 25;10(1):15764. doi: 10.1038/s41598-020-72760-7.

Authors

Shugo Yoshii¹, Ryo Ohshima¹, Yuichiro Ando¹, Teruya Shinjo¹, Masashi Shiraishi²

Affiliations

¹ Department of Electronic Science and Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan.
² Department of Electronic Science and Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan. [email protected].

Abstract

To explore the further possibilities of nanometer-thick ferromagnetic films (ultrathin ferromagnetic films), we investigated the ferromagnetic resonance (FMR) of 1 nm-thick Co film. Whilst an FMR signal was not observed for the Co film grown on a SiO₂ substrate, the insertion of a 3 nm-thick amorphous Ta buffer layer beneath the Co enabled the detection of a salient FMR signal, which was attributed to the smooth surface of the amorphous Ta. This result implies the excitation of FMR in an ultrathin ferromagnetic film, which can pave the way to controlling magnons in ultrathin ferromagnetic films.