Structure and magnetic properties of strontium ferrite anisotropic powder with nanocrystalline structure

S. V. Ketov, Y. D. Yagodkin, V. P. Menushenkov

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    The phase composition, nanocrystallite size, lattice microstrain and particles morphology of a SrFe12O19 powder subjected to milling and subsequent annealing were studied by various methods. The investigations showed that the high-temperature annealing of the preliminarily milled powder resulted in the increase in the coercive force (μ0i) of the SrFe12O19 powder up to 0.4 T owing to the formation of nanocrystalline structure (D ∼ 10 3 nm) with low lattice microstrains. However, the annealed powder cannot be textured in an applied magnetic field because of random orientations of the crystallites in powder particles. A processing technique, which includes the low-temperature annealing of powder in an applied magnetic field, was suggested. It allowed us to produce the anisotropic powder of the strontium ferrite with the nanocrystalline structure that ensures the high coercive force of the powder (∼0.4 T) and possibility of the powder texturing in the magnetic field. The prepared samples textured in a magnetic field exhibit the higher both remanence (by a factor of 1.4) and energy product (by a factor of 2.1) as compared to those of isotropic SrFe12O19 samples.

    Original languageEnglish
    Pages (from-to)1065-1068
    Number of pages4
    JournalJournal of Alloys and Compounds
    Volume509
    Issue number3
    DOIs
    Publication statusPublished - 2011 Jan 21

    Keywords

    • Hard magnetic material
    • Nanocrystalline structure
    • Strontium hexaferrite

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

    Fingerprint Dive into the research topics of 'Structure and magnetic properties of strontium ferrite anisotropic powder with nanocrystalline structure'. Together they form a unique fingerprint.

    Cite this