Abstract
Hard magnetic SrFe10.5Al1.5O19 hexaferrite and soft magnetic Fe3O4 ferrite with cubic spinel structure were synthesized by Pechini method and subsequently mixed and sinterized to obtain an isotropic, polycrystalline SrFe10.5Al1.5O19/Fe3O4 nanocomposite. A noticeable coercivity of 648 kA/m was observed, together with a saturation magnetization of 0.2 T. The magnetization reversal process for the nanocomposite was described in terms of recoil area and Henkel plots. Field intensity range between 0 and 600 kA/m was identified as a favoring magnetizing interaction, whereas at higher fields, dipolar interactions destabilize magnetized states favoring magnetization reversal. The field interval for which the intergranular exchange interaction facilitates reversible coherent rotation between constituent grains was determined within 0–220 kA/m. Above 220 kA/m, a progressive deterioration of the exchange coupling gives way to the demagnetizing process towards full magnetization reversal.
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