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We study the low temperature magnetic properties of nanoparticles of puretransition metal carbide, viz., Co2C, with an average particle diameter of $40\pm 10$ nm. These Co2C nanoparticles are ferromagnetic (FM) up to roomtemperature with blocking temperatures above room temperature. The coercivefield shows abrupt deviation from the Kneller law below 50 K. In this lowtemperature regime the magnetization hysteresis loop shows shifts due toexchange bias (EB) effect, with an exchange field of ~ 250 Oe. Analysis oftraining of the EB effect and ac and dc magnetic measurements suggest that EBarises in the nanoparticles due to a core-shell structure with a FM core and acluster glass shell. The shell contains uncompensated spins, some of which arefreely rotatable while some are frozen. DFT calculations of structural andmagnetic properties of small Co2C clusters of diameter of few Angstroms confirma core-shell structure, where the structurally ordered core has uniformmagnetic moment distribution and the structurally disordered shell hasnon-uniform moment distribution.

The Exchange Bias effect in pure Co2C nanoparticles