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Magnetic and magneto-functional behavior of a Fe-doped MnNiGe alloy withnominal composition Mn$_{0.85}$Fe$_{0.15}$NiGe have been investigated inambient as well as in high pressure condition. The alloy undergoes first ordermartensitic phase transition (MPT) around 200 K and also shows largeconventional magnetocaloric effect (MCE) ($\Delta S$ $\sim$ -21 J/kg-K formagnetic field ($H$) changing from 0-50 kOe) around the transition in ambientcondition. Application of external hydrostatic pressure ($P$) results a shiftin MPT towards the lower temperature and a clear decrease in the saturationmoment of the alloy at 5 K. The peak value of MCE is also found to decreasewith increasing external $P$ ($\sim$ 18 J/kg-K decrease in $\Delta S$ has beenobserved for $P$ = 12.5 kbar). The most interesting observation is theoccurance of exchange bias effect (EBE) on application of external $P$. Thecompeting ferromagnetic and antiferromagnetic interaction in presence ofexternal $P$ plays the pivotal role towards the observation of $P$ induced EBE.

Hydrostatic pressure tuned magneto-structural transition and occurrence of pressure induced exchange bias effect in Mn$_{0.85}$Fe$_{0.15}$NiGe alloy