Large magnetodielectric response in spinel Ni0.5Co0.5Cr2O4.

We have studied the structural, magnetic and magnetodielectric measurements of polycrystalline Ni0.5Co0.5Cr2O4. The magnetic measurement shows that Curie temperature is 80 K for the spinel ferrimagnet Ni0.5Co0.5Cr2O4. We found another magnetic transition at 33K besides Curie temperature. Magnetodielectric measurements of Ni0.5Co0.5Cr2O4 suggest an anomaly at 45 K. Below Curie temperature (45 K), a strong magnetic field dependence of the dielectric constant is observed with cusp-like curve. The strength of the large magnetodielectric response in this system can be explained by optimal spin-orbit coupling. [ABSTRACT FROM AUTHOR]