Reducing switching current with Gilbert damping constant in nanomagnets with perpendicular anisotropy under Dzyaloshinskii-Moriya interaction

We report current-induced magnetization switching (j sw) with a nanosecond-duration pulse current (t p) in a perpendicularly magnetized nanomagnet under the Dzyaloshinskii-Moriya interaction (DMI) and investigate the effect of the Gilbert damping constant (alpha), t p, and DMI value (D) on j sw via micromagnetic simulations. When alpha is sufficiently small at t p = 1 ns, j sw for D = 1.0 erg cm-2 decreases by 42% compared to that for D = 0 erg cm-2. Further, j sw can be reduced under the DMI when alpha is small and t p is short, which is attributed to the twisted magnetization and increased initial magnetization angle.

Automated summary

This study reports current-induced magnetization switching in a perpendicularly magnetized nanomagnet under specific conditions and investigates the influencing factors. The results demonstrate that the magnetization switching can be reduced under certain conditions, which is of great significance for exploring the characteristics of nanomagnets.