The sign reversal of magnetization is observed in LaCr0.85Mn0.15O3 compound and the maximum magnetic compensation temperature (Tcomp) was at around 100 K. We have also observed negative and positive values of exchange bias field (HEB) having sign reversal at around Tcomp. The value of HEB could be tuned from −2.1 kOe to + 2.6 kOe with change in temperature. The competition between the magnetic moment due to the canted ferromagnetic component of Cr3+ ions and the paramagnetic component of doped Mn3+ ions under the negative internal field gives rise to magnetization reversal. The origin of sign reversal of HEB is discussed in detail.
Single phase samples of LaCr1−xFexO3 for x = 0–0.50 were prepared and their magnetic properties were studied to understand the magnetization reversal. Magnetization reversal was observed even for 5 at. % of Fe doping and it persisted up to x = 0.15. Ferromagnetic like behavior with a large coercive field of the order of 0.5 T was observed in the intermediate composition range of x = 0.20–0.40. However, for x = 0.45 and 0.50, magnetization reversal was again observed. Magnetization reversal was studied in detail by carrying out field cooled magnetization measurements for different applied magnetic fields. The mechanism of magnetization reversal for low Fe concentrations (x = 0.05–0.15) is basically due to the paramagnetic behavior of doped Fe ions under the influence of negative internal field arising from the antiferromagnetically ordered Cr3+ ions. The value of maximum negative internal field was estimated to be −3.5 kOe. On the other hand, the mechanism of magnetization reversal for x = 0.45 and 0.50 samples is found to be quite different. They could be quantitatively analyzed based on the model, where the competition between single ion anisotropy and Dzyaloshinsky–Moriya interaction is taken into account.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.