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

Abstract

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 (α), t p, and DMI value (D) on j sw via micromagnetic simulations. When α 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 α is small and t p is short, which is attributed to the twisted magnetization and increased initial magnetization angle.