Articles written in Bulletin of Materials Science

    • Low dielectric losses and enhanced magnetic property of ErIG(x)/YIG(1-x) (x= 0.5) composite for antenna applications


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      The composite of yttrium iron garnet (YIG) and erbium iron garnet (ErIG; i.e., ErIG(x)/YIG(1-x) (x = 0.5)) was prepared by facile mechanical blending method. X-ray diffraction study reveals the pure phase formation of YIG, ErIG and ErIG(x)/YIG(1-x). Field-emission scanning electron microscope micrographs were used to calculate grain size of the samples. Impedance analyser was used to study dielectric property of YIG, ErIG and ErIG(x)/YIG(1-x). The composite ErIG(x)/YIG(1-x) has larger values of dielectric constant and lower values of tangent losses ${\sim}$0.05 at 1 MHz. Calculated ac conductivity of ErIG(x)/YIG(1-x) composite is low, which implies its resistive nature. The value of coercivity ($H_c$) is lesser and value of magnetic saturation ($M_s$) is high for composite as compare to parent YIG and ErIG. The calculated value of microwave operating frequency (${\omega}_m$) for composite was found to be 4.5 GHz. The good dielectric property, low dielectric losses and enhanced magnetic property of ErIG(x)/YIG(1-x) composite suggest a better option over parent garnet ferrites to be used in microwave devices such as dielectric antennas.

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