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<br /> <p align="justify">Magnetic recording media made by &#119873;&#119889;2&#119865;&#119890;14&#119861;, &#119878;&#119898;&#119862;&#119900;5, &#119878;&#119898;2&#119862;&#119900;17 and several types of permanent magnet...

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Bibliographic Details
Main Author: FARAH DIBA (NIM: 23715305), FADLLAH
Format: Theses
Language:Indonesia
Online Access:https://digilib.itb.ac.id/gdl/view/27072
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Institution: Institut Teknologi Bandung
Language: Indonesia
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Summary:<br /> <p align="justify">Magnetic recording media made by &#119873;&#119889;2&#119865;&#119890;14&#119861;, &#119878;&#119898;&#119862;&#119900;5, &#119878;&#119898;2&#119862;&#119900;17 and several types of permanent magnets have a weakness in mechanical properties that can be replaced by hexagonal barium ferrite (&#119861;&#119886;&#119865;&#119890;12&#119874;19). The intrinsic magnetic properties for magnetic recording media are high coercivity (&#119867;c) and high squarness (Mr/Ms) with large grain sizes. Coercivity (&#119867;c) and grain size are influenced by substitution of Fe3+ with &#119860;&#119897;+3. While the saturation (&#119872;s) and magnetic remanence (&#119872;&#119903;) are enhanced with Polyethlene Glycol 6000 (PEG) as a template. Sol-gel autocombustion method was carry out to synthesize &#119861;&#119886;&#119860;&#119897;1,6&#119865;&#119890;10,4&#119874;19 with variations of PEG addition 0 ; 1 ; 1.5 and 2 g. XRD results showed that the &#119861;&#119886;&#119860;&#119897;1,6&#119865;&#119890;10,4&#119874;19 phase was successfully synthesized using sol-gel autocombustion process without PEG addition. Increasing amount of PEG results &#119861;&#119886;&#119860;&#119897;1,6&#119865;&#119890;10,4&#119874;19 which is not single phase, because the large number of &#120572;&#8722;&#119865;&#119890;2&#119874;3 and &#119861;&#119886;&#119865;&#119890;12&#119874;19. In addition, VSM results confirm intesifying in coercivity (&#119867;c) and magnetic anisotropy (Mr/Ms) in &#119861;&#119886;&#119860;&#119897;1,6&#119865;&#119890;10,4&#119874;19, but the saturation (&#119872;s) and magnetic remanence (&#119872;&#119903;) do not change significantly. Then, through SEM, the rate of crystal growth occurs rapidly at calcination 900oC. Hexagonal structure is formed in &#119861;&#119886;&#119860;&#119897;1,6&#119865;&#119890;10,4O19 with a number of PEG 2 g.