Investigation of the structural and magnetic properties of Y2.8Ca0.2Fe5-Al M O12 (M = Mn and Cr, x = y + z)

• The sol–gel method was used to prepare Y 2.8 Ca 0.2 Fe 5-x Al y M z O 12 (M = Mn and Cr, x = y + z) ferrites at the temperature of 1300 K. • XRD, SEM, EDX and XPS were used to characterize the structure of samples. • B-H magnetic characteristic analyzer and VSM are used to characterize magnetic properties of different ions doped in YIG . • When the Al ions content amount achieves 0.3 and Cr ions content amount achieves 0.4, the magnetic properties of the sample are the best. The structural and magnetic properties of yttrium iron garnet Y 2.8 Ca 0.2 Fe 5- x Al y M z O 12 (M = Mn and Cr, x = y + z ) samples by the sol–gel method were investigated in this paper. Different ion doping can change the structure of the samples and improve the saturation magnetization and permeability of YIG. The lattice constant of all samples was found to vary slightly as the Al, Mn, and Cr ions were doped. Al, Mn, and Cr ions have different effects on the change in permeability and saturation magnetization and are explained in detail. With increasing ion doping, the Curie temperature (T c ) transition point decreased. In this work, magnetic permeability achieved the maximum value of 174.6H/m. The power loss reached a minimum at an Al ion concentration of 0.3 and a Cr ion concentration of 0.4. Cr ions tend to occupy the (a) site first and then occupy the (d) site, and the superexchange interaction between the (a) and (d) sites increases. Therefore, the maximum permeability is achieved at an ion concentration of 0.4. Yttrium garnet can be used as a circulator to keep the signal flowing in one direction, and after broadening the application field of yttrium, garnet can be more widely used in 5G technology.