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http://dx.doi.org/10.5762/KAIS.2020.21.10.30

Changes in Magnetic Properties When Manufacturing Cobalt-substituted Barium Ferrite Powder  

Um, Myeong-Heon (Division of Chemical Engineering, Kongju National University)
Yeon, Je-Uk (Division of Chemical Engineering, Kongju National University)
Lee, Cha-Jin (H&S Hightech Corporation)
Ha, Beom-Yong (Department of Renewable & Electrical Engineering, Yeungjin University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.10, 2020 , pp. 30-39 More about this Journal
Abstract
Single-phase barium ferrite powder was synthesized using the sol-gel method. At this time, an attempt was made to find the optimal experimental conditions for the production of single-phase barium ferrite by varying the Fe to Ba molar ratio (Fe/Ba) and the heat treatment temperature. In addition, cobalt-substituted barium ferrite particles were prepared using cobalt, which has an excellent effect on coercivity control for the production of ferrite fine particles having a coercivity of 2.5 to 5.5 kOe for use in high-density magnetic recording media. The changes in the magnetic properties of these were investigated. X-ray diffraction (XRD), thermogravimetric-differential thermal analysis (TG-DTA), and field emission scanning electron microscopy (FE-SEM) were used to observe the synthesis of single-phase, and Fourier transform infrared spectroscopy (FT-IR) and energy dispersive X-ray spectrometry (EDS) were used to analyze the chemical structure and composition. The coercivity of the cobalt-substituted barium ferrite powder was measured by vibrating sample magnetometry (VSM). As a result, single-phase Barium ferrites were synthesized when the Fe/Ba molar ratio was 10, and the heat treatment temperature was 900 ℃. The coercivity decreased with increasing the amount of Co added. Barium ferrite, having a coercivity of 2.5 to 5.5 kOe for use in high-density magnetic recording media, was synthesized when the Co to Fe(Co/Fe) molar ratio was less than 0.16.
Keywords
Barium Ferrite; Coercivity; Sol-Gel Method; Cobalt; Magnetic Properties;
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