Correlation between Composition and Magnetic Properties of SrFe₁₂O₁₉/Co Nanocomposite Synthesized by the High Energy Ball-Milling Process

Abstract:

Nanocomposites (NCs) (100-x) SrFe₁₂O₁₉/x Co (x = 10, 20, and 30 wt. %) were produced using the high energy ball-milling (HEBM) process. The effects of hard/semi-hard ratio and annealing temperature (800, 900, and 1000 °C) on the exchange-spring in magnetic NCs were discussed. X-ray diffraction examination showed the coexistence of M-type hexaferrite SrFe₁₂O₁₉ (SFO) as the hard phase and CoFe₂O₄ spinel ferrite (CFO) as the semi-hard phase. Using a scanning electron microscope (SEM), the morphology and elemental analysis of the NCs were analyzed. The magnetic performances were investigated via a vibrating sample magnetometer at room temperature. With increasing the CFO content and annealing temperature, the hysteresis loop became narrower and possessed semi-hard magnetic properties. The 10 wt. % Co NCs annealed at 800 °C had the highest coercivity of H_c = 4.2 kOe. These results are correlated with switching field distribution plots that have indicated the efficient exchange-spring between SFO and CFO phases NCs annealed at 800 °C. The studied samples can be a promising candidate in permanent magnets and magnetic recording media applications.

• Periodical: Key Engineering Materials (Volume 911)
• Pages: 77-85
• DOI: https://doi.org/10.4028/p-485x14
• Online since: February 2022
• Authors: Ashraf M. Semaida, Moustafa A. Darwish*, Dmitriy Yu. Karpenkov, Alex V. Trukhanov, Vladimir G. Kostishyn, Vladimir V. Korovushkin, Vladimir P. Menushenkov, Alexander G. Savchenko
• Keywords: Ball-Milling, Elemental Analysis, Exchange-Spring, Morphology, Nanocomposites

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