2021 Fiscal Year Annual Research Report
Investigation of magnetization dynamics in exchange-biased Antiferromagnetic/Ferromagnetic/Non-magnetic (AFM/FM/NM) systems with perpendicular magnetic anisotropy
| Project/Area Number |
19K23583
|
|---|
| Research Institution | Tohoku University |
|---|
Principal Investigator |
NGUYEN THIVANANH 東北大学, 先端スピントロニクス研究開発センター, 助教 (20840101)
|
|---|
| Project Period (FY) |
2019-08-30 – 2022-03-31
|
| Keywords | spintronics / magnetization dynamics / exchanged bias system / damping constant / antiferromagnetic / Cr2O3 / ferromagnetic resonance / PMA |
|---|
| Outline of Annual Research Achievements |
We have studied on static and dynamic magnetic properties of the Pt/Co/Cr2O3/Pt stacked films with perpendicular magnetic anisotropy in order to understand their perpendicular magnetic anisotropy constant (K_U) and the effective out-of-plane damping constant. K_U gradually decreases as the Co layer thickness (t_Co) increases. Damping constant monotonically decreases as t_Co increases up to 0.9 nm, and keeps unchanged as t_Co is in between 0.9 nm and 1.2 nm. Damping constant and K_U increase as the Pt layer thickness (t_Pt) is smaller than 5 nm, and then keep constant when t_Pt is in between 5 nm and 20 nm. These results demonstrate that both damping constant and K_U are very sensitive to t_Co, suggesting the spin-orbital coupling origin of the damping constant enhancement in these system.
|
