Kajian Simulasi Mikromagnetik: Ketergantungan Medan Koersif dengan Besaran Intrinsik Nano-Dot Magnetik dengan Anisotropi Tegak Lurus

  • Purnama B
  • Ismail I
  • Suharyana S
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Abstract

Intisari Kajian simulasi mikromagnetik magnetisasi reversal pada nano-dot magnetik dengan anisotropi tegak lurus telah dilakukan dengan menyelesaikan persamaan Landau-Lifshitz-Gilbert. Model yang disimulasikan nano-dot bahan magnetik pada unit sel Heat Assisted Magnetic Recording (HAMR) dengan dimensi 50 nm × 50 nm × 20 nm, 4πMS = 2500 gauss, TC = 373 K dan konstanta anisotropi K ⊥ = 5.10 5 erg/cm 3. Simulasi ini dilakukan untuk mengetahui faktor-faktor fisis yang berpengaruh pada koersifitas dari pengamatan proses magnetisasi reversal. Hasil simulasi menunjukkan medan koersif meningkat sebesar 18% dengan penurunan redaman Gilbert dari α = 1 hingga α = 0,3. Akhirnya, peningkatan medan koesif juga teramati sebesar 32,7% dengan penurunan konstanta exchange stiffness dari A = 1.10 −6 erg/cm hingga A = 1.10 −7 erg/cm. 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, 4πMS = 2500 gauss, TC = 373 K and anisotropy constant K ⊥ = 5.10 5 erg/cm 3. 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 α = 1 to α = 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.

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APA

Purnama, B., Ismail, I., & Suharyana, S. (2013). Kajian Simulasi Mikromagnetik: Ketergantungan Medan Koersif dengan Besaran Intrinsik Nano-Dot Magnetik dengan Anisotropi Tegak Lurus. Jurnal Fisika Dan Aplikasinya, 9(1), 30. https://doi.org/10.12962/j24604682.v9i1.835

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