This article reports synthesis, magnetic and dielectric properties of nanocrystalline XCr2O4 (X=Co/Mn) grafted on graphene oxide (GO) sheets. The nanocomposites are synthesized through a wet-chemical route and are characterized by the powder X-ray diffraction (PXRD) technique, primarily. Transmission electron microscopy (TEM) studies confirm homogeneous grafting of XCr2O4 (X=Co/Mn) nanoparticles ( \(\approx\) 10 nm) on widespread GO sheets. Having a high moment, XCr2O4 (X=Co/Mn) dominates the magnetic properties. The dielectric property is governed by GO due to its insulating nature. The gradual change of magnetic order, from paramagnetic to collinear ferrimagnetic, to spiral order, is seen in the thermal variation of magnetization with the lowering of temperature. A small exchange bias field, originating from the interaction between the conical spiral spin and the collinear ferrimagnetic spin below the spiral order temperature, has been recorded for both compounds. The dielectric behavior is mainly dominated by the host itself. However, detailed analysis prescribes a charge relaxation in these insulating composites obeying Arrhenius-type electronic conduction phenomena. A comparative study points to the contrast of magnetic features originating from different anisotropies, interparticle interactions, and variation in particle sizes, with almost identical dielectric properties.
