FABRIKASI PITA MAGNETIK BERBAHAN NANOPARTIKEL MnFe2O4/ PVA DAN KARAKTERISASI SIFAT KEMAGNETANNYA

EASY SEPTIANA, Dr. Edi Suharyadi, M.Eng

2016 | Tesis | S2 Ilmu Fisika

Pita megnetik berbahan nanopartikel MnFe2O4/ PVA (manganese ferrite /Polyvinyl Alcohol) berhasil disintesis dengan metode kopresipitasi. Ukuran partikel untuk sampel MnFe2O4, MnFe2O4/PVA 17%, 25% dan 67% masing- masing adalah 35,44 nm, 11,63 nm, 13,13 nm dan 13,20 nm. Hasil pengukuran VSM (Vibrating Sample Magnetometer) menunjukkan magnetisasi maksimum pada 15 kOe MnFe2O4 adalah 18,95 emu/g, magnetisasi pada 15 kOe MnFe2O4 menurun seiring peningkatan konsentrasi dari 18,84 emu/g, menjadi 6,43 emu/g. Magnetisasi remanen cenderung menurun seiring peningkatan konsentrasi PVA dari 2,01 emu/g menjadi 1,06 emu/g. Koersivitas cenderung meningkat seiring peningkatan konsentrasi PVA dari 57,92 Oe menjadi 86,67 Oe . Hasil AFM (Atomic Force Microscopy) menunjukkan pelapisan dengan PVA dapat mengurangi aglomerasi nanopartikel. Nilai kekasaran permukaan Surface Roughness (rms) menurun dengan penambahan PVA. MFM (Magnetic Force Microscopy) menunjukkan magnetic contrast semakin jelas dengan berkurangnya penambahan PVA.

The magnetic ribbon of Manganesse ferrite (MnFe2O4) nanoparticles/Polyvinyl Alcohol (PVA) has been successfully fabricated by using co-precipitation method. Particle sizes of nanoparticles MnFe2O4 sample and magnetic ribbon of MnFe2O4/PVA 17%, MnFe2O4 /PVA 25%, MnFe2O4 /PVA 67% sample are 35,4 nm, 11,63 nm, 13,13nm and 13,20 nm, respectively. The result of VSM (Vibrating Sample Magnetometer) measurement showed that maximum magnetization at 15 kOe decreased from 18,84 emu/g to 6,43 emu/g. The coercivity increased from 57,92 Oe to 86,67 Oe as the concentration of PVA increased. The AFM (Atomic Force Microscopy) analysis showed that the encapsulated PVA decreased nanoparticles agglomeration. Surface roughness decreased by the increase of the concentration of PVA. The MFM (Magnetic Force Microscopy) analysis showed that magnetic contrast become stonger as the concentration of PVA decreased.

Kata Kunci : co-precipitation, Manganese Ferrite (MnFe2O4), Polyvinyl Alcohol (PVA), ribbon