Improved structural and magnetic properties of a non-stoichiometry Ba:Fe ratio of barium hexaferrite film

Abstract

In this study, barium hexaferrite film with different Ba:Fe molar ratios (1:2, 1:4, 1:6, 1:8, 1:10 and 1:12) has been synthesized by a sol–gel method and annealed at a temperature of 800 °C in the air. The structural, morphological and magnetic properties of the films have been analyzed by an X-ray diffractometer, a field emission scanning electron microscope and a vibrating sample magnetometer, respectively. The structural analysis revealed that the film with Ba:Fe ratio of 1:4, 1:6, 1:8 and 1:10 crystallized into single phase of BaFe12O19. The morphology study showed that a film with different Ba:Fe ratios has different grain size and shapes. The magnetic measurement at room temperature showed that the film with Ba:Fe ratio of 1:10 has the highest coercivity, Hc value and the film with Ba:Fe ratio of 1:4 exhibits the highest magnetization saturation, Ms value. Because of their high coercivity values, all of the single-phase films are suitable for permanent magnet and data storage applications.