Tuning static and high frequency magnetic properties of SrFe12−x(Mn0.5Co0.5Ti)x/2O19 nanoparticles and thin films via chemical control

This study is intended to evaluate the structural, magnetic, and reflection loss of Mn-Co-Ti susbtituted strontium hexaferrite SrFe12−x(Mn0.5Co0.5Ti)x/2O19 nanoparticles with x=0-2.5 synthesized by a sol-gel combustion method. The thin films of ferrite with the same composition were also prepared. These particles were evaluated to characterize the structural, magnetic, and reflection loss properties of prepared samples by use of X-ray diffraction, field-emission scanning electron microscopy, Mössbauer spectroscopy, vibrating-sample magnetometer, and vector network analyzer. The XRD and SEM results confirmed the presence of strontium ferrite phase with magnetoplumbite structure and narrow size distribution in all synthesized samples. The substituted cations were located in 4f1 and 2b sites. According to hysteresis loops, magnetization increased and coercivity decreased. The reflection loss characteristics of this ferrite were investigated in the12-18 GHz range. SEM and AFM micrographs showed that with an increase in substitution content, the grain size increases. Magnetic susceptibility of thin films was characterized and it was found that the real parts of susceptibility were decreased by an increase in substitution content, while imaginary parts enhanced.