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

• Published in: Applied physics express Vol. 16; no. 11; pp. 113001 - 113004
• Main Authors: Yamada, Keisuke, Takamatsu, Shun-ichi, Asakawa, Hiroki, Nakatani, Yoshinobu
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.11.2023
• Subjects: Dzyaloshinskii–Moriya interaction; Gilbert damping constant; magnetization switching; nanomagnet; spin-transfer torque; STT-MRAM; thermal stability
• ISSN: 1882-0778; 1882-0786
• DOI: 10.35848/1882-0786/ad03d3

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.