Research Projects

Magnetic materials will play a significant role in determining the design of the next electronic circuits and devices. The mixed valence perovskite manganites are a fascinating group of substances with a wide range of potential applications. The outstanding properties of magnetic orthochromites, like their superior electrical conductivity, exchange bias behavior, and high magnetization reversal, indicate their enormous potential for a wide range of electronic applications. R2CoMnO6 (where R is a trivalent rare earth element) has recently attracted scientific attention due to its fascinatingly complex magnetic behavior, which has led to a wide range of possible uses. The super-exchange interactions across Co2+-O2--Mn4+ networks result in FM ordering, and they are primarily observed in monoclinic structures with P21/n space groups. Magnetization reversal (MR), tunable exchange bias behavior, spin-phonon coupling, magnetocaloric effect, low-temperature magnetic frustration, metamagnetic behavior, magneto-electric coupling, multiferroic behavior, and large magneto-resistance-like features are all displayed by compounds like La2CoMnO6, Sm2CoMnO6, Tb2CoMnO6, Er2CoMnO6, Y2CoMnO6, and others. A few research groups have begun studying Ho2CoMnO6 and have reported an FM Tc of about 77 K at a 7 T field with a large magnetic entropy (ΔSm) of 12 J/kg.K. This material was applicable for magnetic refrigeration. To understand the Co-Mn-based family R2CoMnO6's ordered DPs' magnetic, dielectric, magneto-dielectric, and magneto-electric characteristics (R-rare earth element) are thoroughly investigated. The Co and Mn ions are expected to be in the 2+ and 3+ oxidation states in the ordered R2CoMnO6, while both will be in the 3+ state for the disordered phase. FM ordering results from superexchange (SE) interactions across Co2+-O2--Mn4+ networks in the ordered state. On the other hand, the interaction between the Co2+-O2--Co2+ and Mn4+-O2--Mn4+, as well as the existence of Co3+/Mn3+ ions, can occasionally result in a small AFM phase because of antisite defect (ASD) and antiphase Boundary (APB). Nevertheless, certain observations indicate that the SE interaction between Co3+-O-Mn3+ causes FM at low temperatures in the disordered state. Co-Mn-based DP was important because of its complicated magnetic structure, which produces complex magnetic features at low temperatures. A few interesting magnetic properties are added to the material by this mixed phase, including the spontaneous electric polarization that results from the collapse of spatial inversion symmetry. To tune and understand their magnetic characteristics in this way, our present study is focused on investigating the ferroelectric and magnetic DP materials based on Co-Mn (Ho2CoMnO6). To the best of our knowledge, despite their great interest, not much research has been done on nanostructured Ho2CoMnO6.