Tunable resistivity due to kinetic arrest of antiferro-ferromagnetic transition in FeRh_(0.46)Pd_(0.54)

摘要

We show a large negative magnetoresistance (MR) of approximate to 10% near room temperature in FeRh0.46Pd0.54, which increases to more than 60% at low temperatures. The magnitude of resistivity and, hence, MR depend on the history of the sample in HT (magnetic field-temperature) space, e.g., resistivity at 5 K changes by more than 70% with thermal cycling. These results are explained due to slow kinetics of the transformation from austenite anti-ferromagnetic (AF) to martensite ferromagnetic (FM) state with the decrease in temperature. As a result, AF to FM transformation remains incomplete on experimental time scales and non-ergodic AF phase coexists with a low temperature equilibrium FM phase. In the present system, the kinetics of the transition is shown to dominate up to 150 K, which is significantly high in comparison to other kinetically arrested systems. Published by AIP Publishing.