Kajian Simulasi Mikromagnetik: Ketergantungan Medan Koersif dengan Besaran Intrinsik Nano-Dot Magnetik dengan Anisotropi Tegak Lurus Budi Purnama, Ismail, Suharyana

Abstract

Micromagnetic magnetization reversal simulation study of magnetic nano-dot with perpendicular anisotropy has been performed by solving the Landau - Lifshiz-Gilbert equation. A model simulated is magnetic nano-dot materials as considering Heat Assisted Magnetic Recording (HAMR) cell units with dimensions of 50 nm × 50 nm × 20 nm, 4 piMS = 2500 gauss, TC = 373 K and anisotropy constant K = 5.10⁵ erg/cm³. The simulation was conducted to determine physical factors that affect to coercive field. Simulation results show the coercive field increased by 18% with decreased Gilbert damping constant from o = 1 to o = 0.3. Finally, the increased of coercive field also observed by 32.7% with decreased exchange stiffness constant from A = 1.10^-6 erg/cm to A = 1.10^-7 erg/cm.