Indium doping effect on the magnetic properties of Y-type hexaferrite Ba 0.5 Sr 1.5 Zn 2 (Fe 1-x In x ) 12 O 22

Abstract The effect of indium doping on structural and magnetic properties of Y-type hexaferrite Ba 0.5 Sr 1.5 Zn 2 (Fe 1- x In x ) 12 O 22 ( x  = 0, 0.02, 0.04, 0.06, 0.08 and 0.1) prepared by the solid state reaction method was investigated. The Rietveld refinement method was used to analyze the X-ray diffraction patterns. The magnetic transition temperatures associated with the proper-screw spin phase to the collinear ferrimagnetic spin phase transition can be efficiently modulated by varying indium content. The magnetic transition temperature increases to a maximum with indium content x  = 0.04 and then decreases with x , suggesting the possibility that electrically controlled magnetization reversal can be can be effectively tailored by varying indium content. The saturation magnetization at room temperature was decreased as increasing indium content, which can be explained as the metal ions occupation. It is worthy to note that the coercivity of In-doped samples was decreased drastically compared that of undoped sample, which is probably resulted from the reduction in anisotropy field with substitution of In 3+ for Fe 3+ . The In-doped hexaferrite Ba 0.5 Sr 1.5 Zn 2 (Fe 1- x In x ) 12 O 22 may be potential candidates for application in magnetoelectric devices.