Pustaka Ilmiah Universitas Padjadjaran

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Preparasi Film Tipis Nano Magnetik dengan metode Sol Gel dan Karakterisasinya untuk Aplikasi Media Perekam Berkapasitas Tinggi

Dalam penelitian tahap I ini, telah berhasil disintesis bahan magnetik CoFe2O4 dengan metode sol gel. Prekursor Co2- menggunakan senyawa [Co(CH3COO2)2.4H2O] dan prekursor Fe3+ menggunakan senyawa [Fe(CH3COO2)2.9H2O] dicampur dengan variasi mol persen Co2+: 33%, 40% dan 50%, dilarutkan dalam 2-methaoxyethanol (100 cc) dan diethanolamine (2 cc). Selanjutnya campuran bahan dan larutan tersebut direfluks pada suhu 700C selama 12 jam. Hasil pengukuran XRD ditunjukkan bahwa kristal CoFe2O4 sudah terbentuk. Hasil pengukuran Vibrating Sample Magnetometer (VSM) menunjukkan karakteristik easy-axis terjadi pada aplikasi medan magnetik tegak lurus bidang sampel. Parameter karakteristik magnetik sampel target dengan 33% Co adalah Mr = 5,3277 emu/gr, Hc = 138,8 Oe, Br = 65,3859 kOe, dan BH maks = 2,2804 MGOe. Sedangkan parameter karakteristik magnetik sampel lapisan tipis 33% Co adalah mr = 1,8261×10-4emu, Hc = 651,064 Oe, sampel lapisan tipis 40% Co adalah mr = 3,5997×10-4 emu, Hc = 426,4633 Oe, dan sampel lapisan tipis 50% Co adalah mr = 3,8984×10-4 emu, Hc = 542,5 Oe. Peningkatan nilai saturasi magnetik sebanding dengan peningkatan persentasi mol Co2+

Synthesis of magnetic materials CoFe2O4 have been succesfully done by utilize of sol gel methods.The Co2+ precursor is [Co(CH3COO2)2.4H2O] compound and Fe3+ precursor is [Fe(CH3COO2)2.9H2O] compounds. All the precursors were mixing with the variation of percent mol concentration by 33%, 40% and 50% for ion Co2+, solved in the solution of 2-methaoxyethanol (100 cc) and diethanolamine (2 cc). The solution was reflux at temperature of 70oC for 12 hours to increase of the reaction of ion. The XRD measurements show the crystal of CoFe2O4. The magnetic characteristic of bulk CoFe2O4 in 33 % percent mol were Mr = 5,3277 emu/gr, Hc =138,8 Oe, Br = 65,3859 kOe, BHmaks = 2,2804 MGOe. The Vibrating Sample Magnetometer (VSM) measurements show that the easy-axis are in perpendicular plane. The magnetic characteristic of thin films CoFe2O4 in 33 % mol were mr = 1,8261×10-4emu, Hc = 651,064 Oe, in 40% mol Co were mr = 3,5997×10-4 emu, Hc = 426,4633 Oe, and in 50% mol Co were mr = 3,8984×10-4 emu, Hc = 542,5 Oe. The magnetic saturation of thin films increase by increasing of persent mol of Co2+ ion.