[10p-S302-1~18] 10.2 Fundamental and exploratory device technologies for spin

▼ [10p-S302-13] Investigation of magnetization dynamics in an ultrathin cobalt by the spin-torque ferromagnetic resonance

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

Keywords:Spintronics, ultra-thin ferromagnetic film, Ferromagnetic resonance

We realized excitation of ferromagnetic resonance (FMR) by a weak external magnetic field and significant reduction of magnetization damping in 1 nm-thick ultrathin Co film by inserting Ta buffer layer, which expanded a possibility of tunable magnetization dynamics that can appear in an ultrathin magnetic film. In addition, it is expected that spin-torque ferromagnetic resonance (ST-FMR), which has been the platform for research of magnetization dynamics, can be observed in an ultrathin Co film on a Ta buffer layer. To explore the potential of magnetization dynamics in an ultrathin ferromagnetic film, we investigated ST-FMR in an ultrathin Co/Ta bilayer.