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Crystallization of acicular platelet particles of W-type hexagonal strontium ferrite for magnetic recording applications

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Abstract

Acicular platelets of the W-type hexagonal strontium ferrite (SrFe18O27) have been crystallized from the borate glass system with the aid of ∼ 1 mol% SiO2 and Bi2O3. It was found that particle size and morphology of the system can be effectively altered by proper use of the additives and the thermal treatment of the samples. Addition of SiO2 induces growth of ferrite as fine grains (average size ∼ 0.1μm), while Bi2O3 with the acicular-shaped particles (which are platelets) with an aspect ratio of ∼ 10 are formed. The system also exhibits a relatively sharp particle size distribution compared to that for the samples containing no additive. Detailed magnetic and microstructural measurements of all the useful samples were carried out to characterize them for applications in magnetic recording devices.

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  1. Department of Materials Science and Engineering, McMaster University, L8S 4L7, Hamilton, Ontario, Canada

    Shanker Ram

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  1. Shanker Ram
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Ram, S. Crystallization of acicular platelet particles of W-type hexagonal strontium ferrite for magnetic recording applications. J Mater Sci 25, 2465–2470 (1990). https://doi.org/10.1007/BF00638043

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  • DOI: https://doi.org/10.1007/BF00638043

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