Influence of ferromagnetic cobalt on microstructural and magnetic trends of sol–gel routed rare earth and aluminium based BaSr-Hexaferrites (Ba_0.6Sr_0.3Er_0.1Fe_11.5-xAl_0.5Co_xO₁₉)

The present study reports the sol–gel routed synthesis of M-type Ba_0.6Sr_0.3Er_0.1Fe_11.5-xAl_0.5Co_xO₁₉ (x = 0.00, 0.5, 1.0, 1.5 and 2) hexaferrites. The impacts on the structural and magnetic properties of these hexaferrites were next examined at various doping contents. Various techniques were then used to characterize these samples. The X-ray diffraction findings confirmed the pure hexagonal phase with no prominent peaks of impurity. Scanning Electron Microscopy (SEM) revealed that hexaferrites with uniform particle dispersion were formed. The magnetic properties of Ba_0.6Sr_0.3Er_0.1Fe_11.5-xAl_0.5Co_xO₁₉ hexaferrites at room temperature showed that a doping level of (x = 1.5), Ba_0.6Sr_0.3Er_0.1Fe_11.5-xAl_0.5Co_xO₁₉ hexaferrites showed excellent magnetic properties with m_B = 10.197µB, M_s = 54.126 emu/g, H_c = 4.172 kOe, and H_a = 1.303 kOe along with anisotropy parameter B suggested a decrease in the resistance of magnetic domains. The magnetic characteristics of Barium hexaferrites was considerably improved through the doping of cobalt, making these types of hexaferrites highly beneficial in numerous magnetic applications.