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Composite quantum materials are the ideal examples of multifunctional systemswhich simultaneously host more than one novel quantum phenomenon in physics.Here, we present a combined theoretical and experimental study to demonstratethe presence of an extremely large exchange bias in the range 0.8 T - 2.7 T anda fully compensated magnetic state (FCF) in a special type of Pt and Ni dopedMn$_3$In cubic alloy. Here, oppositely aligned uncompensated moments in twodifferent atomic clusters sum up to zero which are responsible for the FCFstate. Our Density functional theory (DFT) calculations show the existence ofseveral possible ferrimagnetic configurations with the FCF as the energeticallymost stable one. The microscopic origin of the large exchange bias can beinterpreted in terms of the exchange interaction between the FCF background andthe uncompensated ferrimagnetic clusters stabilized due to its negligibleenergy difference with respect to the FCF phase. We utilize pulsed magneticfield up to 60 T and 30 T static field magnetization measurements to confirmthe intrinsic nature of exchange bias in our system. Finally, our Hall effectmeasurements demonstrate the importance of uncompensated noncoplanarinterfacial moments for the realization of large EB. The present finding ofgigantic exchange bias in a unique compensated ferrimagnetic system opens up adirection for the design of novel quantum phenomena for the technologicalapplications.

Intra-unitcell cluster-cluster magnetic compensation and large exchange bias in cubic alloys