Effect of pb on the magnetic interactions of the M-type hexaferrites

This work reports the magnetic interactions of M-type lead hexaferrites. The samples were prepared using the solid state reaction method varying the lead concentration and compensating its lost by thermal treatment in order to obtain pure phases. The structural characterization was made through X-ray diffraction and the Rietveld refinement method. The morphology and grain-growth analysis were carried out using scanning electron microscopy. The magnetic interactions were studied through isothermal remanence (IRM) and DC demagnetization (DCD) remanence curves and through the construction of Henkel plots. By analyzing deviations from the Stoner-Wohlfarth model for non-interacting particles, it was determined the way in which lead modifies the interaction state in the hexaferrites. The experimental results show that the demagnetizing interactions prevail in systems with high lead content, and as lead concentration diminishes the intensity of magnetic interactions also decreases giving rise to magnetizing interactions © 2015 Elsevier B.V. Allrightsreserved.

Henkel plot; IRM/DCD; Magnetostatic and exchange interactions; Substituted hexaferrite Ferrite; Grain growth; Lead; Remanence; Rietveld refinement; Scanning electron microscopy; Solid state reactions; Synthetic metals; X ray diffraction; Henkel plots; Hexaferrites; IRM/DCD; Non-interacting particles; Rietveld refinement method; Solid state reaction method; Stoner-Wohlfarth model; Structural characterization; Magnetism

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