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<br /> <p align="justify">Magnetic recording media made by 𝑁𝑑2𝐹𝑒14𝐵, 𝑆𝑚𝐶𝑜5, 𝑆𝑚2𝐶𝑜17 and several types of permanent magnet...
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Format: | Theses |
Language: | Indonesia |
Online Access: | https://digilib.itb.ac.id/gdl/view/27072 |
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Institution: | Institut Teknologi Bandung |
Language: | Indonesia |
Summary: | <br />
<p align="justify">Magnetic recording media made by 𝑁𝑑2𝐹𝑒14𝐵, 𝑆𝑚𝐶𝑜5, 𝑆𝑚2𝐶𝑜17 and several types of permanent magnets have a weakness in mechanical properties that can be replaced by hexagonal barium ferrite (𝐵𝑎𝐹𝑒12𝑂19). The intrinsic magnetic properties for magnetic recording media are high coercivity (𝐻c) and high squarness (Mr/Ms) with large grain sizes. Coercivity (𝐻c) and grain size are influenced by substitution of Fe3+ with 𝐴𝑙+3. While the saturation (𝑀s) and magnetic remanence (𝑀𝑟) are enhanced with Polyethlene Glycol 6000 (PEG) as a template. Sol-gel autocombustion method was carry out to synthesize 𝐵𝑎𝐴𝑙1,6𝐹𝑒10,4𝑂19 with variations of PEG addition 0 ; 1 ; 1.5 and 2 g. XRD results showed that the 𝐵𝑎𝐴𝑙1,6𝐹𝑒10,4𝑂19 phase was successfully synthesized using sol-gel autocombustion process without PEG addition. Increasing amount of PEG results 𝐵𝑎𝐴𝑙1,6𝐹𝑒10,4𝑂19 which is not single phase, because the large number of 𝛼−𝐹𝑒2𝑂3 and 𝐵𝑎𝐹𝑒12𝑂19. In addition, VSM results confirm intesifying in coercivity (𝐻c) and magnetic anisotropy (Mr/Ms) in 𝐵𝑎𝐴𝑙1,6𝐹𝑒10,4𝑂19, but the saturation (𝑀s) and magnetic remanence (𝑀𝑟) do not change significantly. Then, through SEM, the rate of crystal growth occurs rapidly at calcination 900oC. Hexagonal structure is formed in 𝐵𝑎𝐴𝑙1,6𝐹𝑒10,4O19 with a number of PEG 2 g. |
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