Effect of interfacial pinning on the thermo-remanent magnetization of disorder Mn sub(50)Ni sub(38.5)Sn sub(11.5) alloy

In this report we show that field cooling through the irreversibility temperature (T sub(irr)) only has more significant effect on the thermo-remanent magnetization (TRM) of martensite phase than the system cooled through its martensite transformation (MT). The large TRM observed at low temperature martensite phase is not associated with the arrest of higher magnetic austenite phase. The pinning of uncompensated spins at the interfaces of magnetically inhomogeneous phases is mainly contributing to the large irreversibility between the TRM curves. This strong pinning results to a huge exchange bias field (H sub(EB))(HEB). A giant entropy change ( Delta S sub(tr) Delta Str) of 18.1 J/kg K and a large negative magneto-resistance (MR) of 27% for field change ( Delta H Delta H) of 50 kOe are estimated across the MT. We have comprehensively discussed these observed behaviours in the paper.