Magnetization reversal and giant coercivity in Co(Cr0.7Mn0.3)2O4

We demonstrate the evaluation of temperature and magnetic field dependent magnetization of single phase sample of cubic spinel Co(Cr_0.7Mn_0.3(₂O₄. It has been noticed that 30% Mn substitution for Cr in CoCr₂O₄ leads to the huge reversal of temperature dependent magnetization below compensation temperature, T_comp ∼ 82.9 K. In addition to this, sample is found to exhibit giant coercivity, reaching about 1.54 T at 3K, similar to hard magnetic materials. These intriguing phenomena are ascribed to the presence of magneto-crystalline anisotropy in the sample.