KAJIAN PENGARUH KETEBALAN, DIMENSI DAN KOMPOSISI TERHADAP PERGESERAN DINDING DOMAIN MAGNETIK PADA LAPISAN TIPIS CoNiFe MENGGUNAKAN OBJECT ORIENTED MICROMAGNETIC FRAMEWORK (OOMMF); STUDY OF THE EFFECT OF THICKNESS, DIMENSION AND COMPOSITION TOWARD PROPAGATION MAGNETIC DOMAIN WALL ON CoNiFe THIN FILM USING OBJECT ORIENTED MICROMAGNETIC FRAMEWORK (OOMMF)

Yunus, Idham, Edi Suharyadi

2015 | Disertasi | FMIPA

The study of domain wall magnetic propagation on CoNiFe thin film magnetic has been done investigated by using software Object Oriented Micromagnetic Framework based on Landau-Lifshitz Gilbert (LLG) equations. The main purpose of this study is to observe effect of thickness, dimension and composition toward magnetization value, magnetization time, and speed of propagation domain wall magnetic and anisotropy energy of CoNiFe thin film. The thickness variations were used 2 nm, 5 nm, 10 nm, 15 nm, 20 nm and 30 nm, with dimension 1 ?m × 1 ?m and composition Co71Ni14Fe15. Variations composition used were1 ?m × 1 ?m, 2 ?m × 1 ?m, and 3 ?m × 1 ?m with a thickness 10 nm and composition Co71Ni14Fe15. Variations composition used were Co52Ni15Fe34, Co62Ni15Fe23 and Co71Ni14Fe15 with a thickness 10 nm and a dimension 1 ? × 1 ? . Simulations done by providing the external field in the direction of X positive axis by 0 to 6000 Oe for variations in thickness, while the variation of the dimensions and composition at 0 to 3000 Oe of 2000 stages. The simulation results showed that in all variations has the domain wall propagation same patterns is moving in the direction of the Y positive axis. At thickness variations, the highest value of the magnetization, simulation time and speed of magnetic domain walls shift in a thickness of 2 nm is 1.00000, 70 ns, and 392.64 m/s at the external field 87 Oe. The highest anisotropy energy possessed a thickness of 30 nm. At dimensional variations, the highest magnetization value on the size of 3 ?m × 1 ?m at 0.9998, the highest rate in the size of 1 ?m × 1 ?m of 55.974 m/s when the external field is 276 Oe. The magnetization time required for all size dimensions are similar, but the larger anisotropy energy when the size of the larger dimensions. In the variation of the composition, the highest value of the magnetization and speed is 0.99978 and 70.42 m/s in the composition Co52Ni15Fe34. All the compositions showed almost the same magnetization time is approximately 360 ns, while the largest anisotropy energy value possessed by Co71Ni14Fe15 composition.

Kata Kunci : CoNiFe thin film; magnetic domain walls propagation; micromagnetic simulation