Abstract
Ferrites which have relatively high remanence ratio, large coercivity and strong anisotropy are needed to meet the increasing demand for devices used in millimeter-wave frequency. Herein, we demonstrate a composition of Sr0.7La0.3Fe12−xAlxO19 hexaferrites prepared by the conventional ceramic method. We investigate the phase, morphology and magnetic properties of Al-substituted strontium hexaferrites. This study illustrates that aluminum substitution has a significant effect to improve the coercivity and anisotropic field. Finally, we propose an empirical relationship between the functional properties of Al-substituted ferrites and the amount of aluminum.
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