Structural, magnetic, dielectric, microwave absorption, and optical characterization of $${\text{Ni}}_{0.1} {\text{Co}}_{0.9} \left({\text{MnZr}} \right)_{x} {\text{Fe}}_{2 - 2x} {\text{O}}_{4}/{\text{Ba}}_{y} {\text{Sr}}_{1 - y} {\text{Fe}}_{12} {\text{O}}_{19}$$ nanocomposites

Abstract

In the present research, structural, magnetic, dielectric, microwave absorption, and optical properties of spinel/hexaferrite nanocomposites have been studied. Nanocomposite series was prepared by physical mixing of soft magnetic spinel ferrite ($${\text{Ni}}_{0.1} {\text{Co}}_{0.9} \left({\text{MnZr}} \right)_{x} {\text{Fe}}_{2 - 2x} {\text{O}}_{4}, \,x = 0.25 \,{\text{and}}\,0.30$$) and hard magnetic hexaferrite ($${\text{Ba}}_{y} {\text{Sr}}_{1 - y} {\text{Fe}}_{12} {\text{O}}_{19},\,y = 1\,{\text{and}}\,0.5$$) in 50:50 proportion. X-ray diffraction (XRD) was done to find out the phases present in the final composite. Scanning electron microscopy (SEM) unfolded the microstructural variation observed with variation of constituent ferrites. Magnetic properties were analyzed using vibration sample magnetometer (VSM) at room temperature in ± 10 kOe field range. Dielectric properties of prepared composites were studied using Impedance analyzer in 100 Hz–120 MHz frequency range. Novel analysis of Ka-frequency band (26.5–40 GHz) properties of the prepared composites was done using vector network analyzer (VNA). UV–Vis–nIR analysis was also done to find out their application in optical domain.