We report anomalous magnetic reversal (MR)/negative magnetization (NM) state associated with the field induced switching of orbital moment (μLSm) of the Sm atom. This material shows an antiferromagnetic transition at Néel temperature (TN240 K) followed by a NM state in between compensation temperatures (T and T). The MR/NM state vanishes above 12.5 kOe, while T and T follow opposite magnetic field dependency in field cooled cooling (FCC) magnetization. In the high field (H>20 kOe), the thermo-magnetization [M(T)] curve produces a mirror like inversion in magnetization within (TT) with respect to its low field FCC counterpart. Within the NM region, the exchange bias field (HEB) changes its sign across compensation temperatures for suitable field cooling (FC). We estimated a large FC inverse and conventional HEB of 8 and 4.8 kOe at T=130 K. Furthermore, the magnetic entropy change (ΔSm) and adiabatic temperature change (ΔTad) calculated from the specific heat [Cp(T,H)] measurements also show sign reversal at T. These unusual behaviors are explained in terms of field induced switching of μLSm, which is oppositely coupled to the spin moment of Sm (μSSm), Mn–Mn/Sm exchange interactions, and polarized conduction electron moment (μSCEP). Additionally, Cp(T,H) exhibit Schottky anomaly around 3 K due to Zeeman splitting of Sm energy levels.

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